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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 15, 2015 08:33 Post subject: Re: Collection of Fiebre Verde |
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Josele wrote: | Surprising, for color and striation almost looks like a Paraiba tourmaline! |
Good point Josele!
Euclase was the first mineral that sprang to my mind for its similarity in color and striation, as it occurs in the same area (Gachalá and Chivor mining districts).
And sometimes it does combine with emerald but that's another story... Emeclase? :-)
Mineral: | Euclase |
Locality: | Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca Department, Colombia | |
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Dimensions: | xl=3cm |
Description: |
Collection of Bill Larson Van Pelt photo |
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30142 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 16, 2015 10:35 Post subject: Re: Collection of Fiebre Verde - Muzo |
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There are lots of clear quartz crystals on this Muzo specimen.
The largest one is sitting next to a lustrous vivid green emerald.
Small but attractive specimen where the beauty of the emerald is magnified by the combination of quartz and calcite atop a black shale host rock.
Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30075 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30068 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30074 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30043 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30027 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30072 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30015 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30057 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 60x46x42mm, xl=13mm |
Description: |
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30080 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 17, 2015 12:42 Post subject: Re: Collection of Fiebre Verde - Coscuez |
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Clean crystal with strong saturation.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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30029 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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29990 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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29971 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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Viewed: |
30007 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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Viewed: |
30009 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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30018 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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29972 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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29987 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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30020 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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30036 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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29988 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 43x38x50mm, xl=11mm |
Description: |
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30016 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 22, 2015 07:10 Post subject: Re: Collection of Fiebre Verde - La Pita |
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A fairly large specimen from La Pita.
There is an aggregate of 2 emerald crystals in the center.
On one side, the aggregate exhibits one single continuous plane along the c axis (image 43b) whereas on the opposite side, the faces of the 2 prisms are clearly differentiated (image 52b).
Some calcite crystals exhibit unusual crystallization patterns (72b & 47b).
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 9cm across, xls=20mm |
Description: |
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29863 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 9cm across, xls=20mm |
Description: |
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29850 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 9cm across, xls=20mm |
Description: |
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29877 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 9cm across, xls=20mm |
Description: |
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29857 Time(s) |
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Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 9cm across, xls=20mm |
Description: |
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29909 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 9cm across, xls=20mm |
Description: |
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29866 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 24, 2015 03:41 Post subject: Re: Collection of Fiebre Verde - Chivor |
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Pencil-shaped emeralds are more commonly seen in the Eastern Belt, in the Chivor district.
Calcite exhibits various lustres (opaque to vitreous) and colors (white to brownish).
There are also some tiny nodules of pyrite in the back.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x70mm, xl=18mm |
Description: |
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Viewed: |
29734 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x70mm, xl=18mm |
Description: |
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Viewed: |
29767 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x70mm, xl=18mm |
Description: |
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Viewed: |
29805 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 24, 2015 15:51 Post subject: Re: Collection of Fiebre Verde - Chivor |
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Matrix is pure white calcite.
Proper lighting combined with high shutter speed produce stunning colors and shades (last 2 images).
Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 50x40x95mm, xl=13mm |
Description: |
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29690 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 50x40x95mm, xl=13mm |
Description: |
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Viewed: |
29729 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 50x40x95mm, xl=13mm |
Description: |
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Viewed: |
29729 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 50x40x95mm, xl=13mm |
Description: |
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Viewed: |
29718 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 25, 2015 13:29 Post subject: Re: Collection of Fiebre Verde - Chivor |
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Light green crystal.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29664 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29623 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29647 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29621 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29721 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29637 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x50x40mm, xl=10mm |
Description: |
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Viewed: |
29650 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 26, 2015 09:28 Post subject: Re: Collection of Fiebre Verde - Coscuez |
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This is a real "ganga" as they use to call matrix specimens in Colombia.
It has a fairly good size and the emeralds are associated with different generations of calcite. The greyish large tabular calcite crystals are also seen in the neighboring La Pita district.
There are some isolated nodules of pyrite in the back.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 95x75x75mm, xl=15mm |
Description: |
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Viewed: |
29512 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 95x75x75mm, xl=15mm |
Description: |
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Viewed: |
29556 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 95x75x75mm, xl=15mm |
Description: |
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Viewed: |
29533 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 95x75x75mm, xl=15mm |
Description: |
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Viewed: |
29529 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 95x75x75mm, xl=15mm |
Description: |
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Viewed: |
29538 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 28, 2015 08:02 Post subject: Re: Collection of Fiebre Verde - La Pita |
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Another "ganga" from La Pita with 3 crystals, all terminated.
Large matrix specimens from this mining district flooded the market in the early 2000's and it was relatively easy to get pieces with multiple crystals.
These days such a specimen would be broken apart into several smaller pieces before being sold.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29469 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29401 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29463 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29415 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29411 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29418 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29412 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 100x50x70mm, largest xl=17mm |
Description: |
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Viewed: |
29406 Time(s) |
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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Posted: Jan 28, 2015 09:46 Post subject: Re: Collection of Fiebre Verde |
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These are great specimens, you are very fortunate to have them, good photo's too! Pardon me for asking, but why do the emeralds occur in calcite veins in shale and limestone? Are there shallow granite intrusions below the deposits providing the source of Beryllium?
Thanks, Mike
_________________ Rock basher |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 28, 2015 10:58 Post subject: Re: Collection of Fiebre Verde |
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Mike Wood wrote: | These are great specimens, you are very fortunate to have them, good photo's too! Pardon me for asking, but why do the emeralds occur in calcite veins in shale and limestone? Are there shallow granite intrusions below the deposits providing the source of Beryllium?
Thanks, Mike |
Thanks Mike!
In the case of the Colombian deposits, the source of beryllium (local/sedimentary vs. deep/magmatic) is uncertain.
But it seems like there is a consensus among scientific bodies to support a sedimentary origin as various studies have proven that the regional black shale had a large enough beryllium reservoir to have been a potential source.
The parent hydrothermal fluids/brines reacted with organic matters in the shales to release trapped chromium, vanadium and beryllium, which in turn enabled emerald formation.
Gerard
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 28, 2015 16:55 Post subject: Re: Collection of Fiebre Verde - Polveros |
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Doubly terminated emeralds are not common, even in Colombia.
This one has a flat wide termination on one end but as the crystal width gets thinner towards the other end, the other termination is much smaller.
Shape is also different as the main crystal divides itself into 2 aggregate crystals on the smaller end.
Host rock is black shale (not pictured).
Considering the rarity of doubly terminated emeralds and the quality of this one, I could not resist flooding this post with many photos.
Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29276 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29268 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29264 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29287 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29281 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29289 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29226 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29253 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29256 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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29283 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
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Viewed: |
29281 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x45mm, xl=34mm |
Description: |
Spectacular contact deformity |
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Viewed: |
29257 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 29, 2015 17:02 Post subject: Re: Collection of Fiebre Verde - Peñas Blancas |
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Cluster of velvety blue-green emeralds which grew in a small cavity embedded in a typical matrix of iron-stained calcite.
Unmistakably from Peñas Blancas.
Mineral: | Beryl (variety emerald), Calcite |
Locality: | Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 78x47x31mm |
Description: |
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Viewed: |
29118 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 78x47x31mm |
Description: |
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Viewed: |
29122 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 78x47x31mm - Detail |
Description: |
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Viewed: |
29093 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 78x47x31mm - Detail |
Description: |
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Viewed: |
29070 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite |
Locality: | Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 78x47x31mm - Detail |
Description: |
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29124 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Jan 31, 2015 14:46 Post subject: Re: Collection of Fiebre Verde - Polveros |
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Another good example of the grass green color commonly found in the La Pita mining district.
This specimen comes from Polveros where serious mining started only in the late 90's.
Emerald is associated with striated calcite and clear quartz.
Host rock is black shale (not pictured).
Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29070 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29059 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29011 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29036 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29025 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29027 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29057 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Quartz |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x51x40mm, xl=9mm |
Description: |
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Viewed: |
29108 Time(s) |
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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Posted: Jan 31, 2015 16:51 Post subject: Re: Collection of Fiebre Verde |
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'In the case of the Colombian deposits, the source of beryllium (local/sedimentary vs. deep/magmatic) is uncertain.
But it seems like there is a consensus among scientific bodies to support a sedimentary origin as various studies have proven that the regional black shale had a large enough beryllium reservoir to have been a potential source.
The parent hydrothermal fluids/brines reacted with organic matters in the shales to release trapped chromium, vanadium and beryllium, which in turn enabled emerald formation.'
Thanks Gerard!
Now I am wondering if there are other similar deposits, of emeralds in calcite veins in black shale, elsewhere in the world. Have there been any studies of the temperature of formation of the emeralds, from the examination of fluid inclusions?
Thank you for your super photographs, I like the specimens with the quartz crystals, they seem to compliment the emerald/calcite combination perfectly!
Regards, Mike
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Feb 01, 2015 08:35 Post subject: Re: Collection of Fiebre Verde |
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Mike Wood wrote: |
Thanks Gerard!
Now I am wondering if there are other similar deposits, of emeralds in calcite veins in black shale, elsewhere in the world. Have there been any studies of the temperature of formation of the emeralds, from the examination of fluid inclusions?
Thank you for your super photographs, I like the specimens with the quartz crystals, they seem to compliment the emerald/calcite combination perfectly!
Regards, Mike |
I appreciate your comments Mike!
From Simandl, G.J., Paradis, S. and Birkett, T. (1999): Colombia-type Emeralds; in Selected British Columbia Mineral Deposit Profiles, Volume 3 :
"Colombia-type emerald deposits differ from the classical schist-hosted emerald deposits in many ways. They are not spatially related to known granite intrusions or pegmatites, they are not hosted by mafic/ultramafic rocks, and are emplaced in non-metamorphosed rocks. Green beryls, where vanadium is the source of colour, are described at Eidsvoll deposit (Norway) where pegmatite cuts bituminous schists. Such deposits may be better classified as pegmatite-hosted."
The Colombian emerald deposits are the only known deposits where there is no evidence of magmatic activity and it has been demonstrated that circulation processes within the host black shales were sufficient to form emerald.
So Colombian emeralds are truly unique also in that sense.
There have been several studies on fluid inclusions which reported temperatures in the range of 290 to 360 deg Celcius for emerald precipitation. For more insights on this topic, I recommend these 2 papers
1) Cheilletz A., Féraud G., Giuliani G., 1994. Time-Pressure and Temperature Constraints on the Formation of Colombian, Economic Geology, Vol. 89.1994, pp. 361-380.
2) Ottaway, T.L., Wicks, F.J., Bryndzia, L.T., Keyser, T.K., Spooner, E.T.C., 1994. Formation of the Muzo hydrothermal emerald deposit in Colombia. Nature 369, 552–554.
Gérard
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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Posted: Feb 01, 2015 11:04 Post subject: Re: Collection of Fiebre Verde |
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Thank you for your informative reply Gerard. The temperature of formation is quite high, I suppose it's because of the proximity of the Andes, or deep burial, or both. I shall try and find these references you have given.
Mike :-)
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Feb 01, 2015 12:06 Post subject: Re: Collection of Fiebre Verde - Chivor |
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These elongated emerald clusters standing at about 30 degrees on a grey shale host rock are typical from Chivor.
They have a slight blue cast which is difficult to render with my lighting conditions.
Pyrite is almost invisible at naked eye.
Unmistakably Chivor!
Last image is for my question - not sure whether these are white bladed albite or calcite crystals.
Not the most spectacular matrix specimen but the host rock, the calcite and the emerald cluster create a very aesthetic combination.
Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 85x65x40mm, cluster=32x19mm |
Description: |
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Viewed: |
28930 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 85x65x40mm, cluster=32x19mm |
Description: |
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Viewed: |
28903 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 85x65x40mm, cluster=32x19mm |
Description: |
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Viewed: |
28895 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 85x65x40mm, cluster=32x19mm |
Description: |
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Viewed: |
28901 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 85x65x40mm, cluster=32x19mm |
Description: |
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Viewed: |
28886 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 85x65x40mm, cluster=32x19mm |
Description: |
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Viewed: |
28973 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Albite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | Detail, FOV=2cm |
Description: |
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Viewed: |
28951 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4106
Location: Germany
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Posted: Feb 02, 2015 11:56 Post subject: Re: Collection of Fiebre Verde |
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What an outstanding specimen! Well, actually MOST of the emeralds you are presenting are outstanding, but this one impressed me the most, simply wonderful!
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Feb 02, 2015 15:38 Post subject: Re: Collection of Fiebre Verde |
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Tobi wrote: | What an outstanding specimen! Well, actually MOST of the emeralds you are presenting are outstanding, but this one impressed me the most, simply wonderful! |
Really appreciate your comments Tobi! Thanks!
When I first saw Colombian emeralds in matrix, my eyes were always focused on the beryl(s).
It took me a while before I realize how much the Colombian matrix with such a variety of combinations of host rocks and minerals would contribute to the emerald aesthetic appeal.
Although Chivor's production is tiny in comparison to Muzo, Coscuez and La Pita, the Chivor specimens take this combination to a level rarely seen in the other districts.
Let me dig a bit :-)
Gérard
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