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Collection of Fiebre Verde
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Fiebre Verde




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PostPosted: Jan 15, 2015 08:33    Post subject: Re: Collection of Fiebre Verde  

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? :-)



Euclase.jpg
 Mineral: Euclase
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca Department, Colombia
 Dimensions: xl=3cm
 Description:
Collection of Bill Larson
Van Pelt photo
 Viewed:  14483 Time(s)

Euclase.jpg


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PostPosted: Jan 16, 2015 10:35    Post subject: Re: Collection of Fiebre Verde - Muzo  

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.



IMG_1954b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14422 Time(s)

IMG_1954b.JPG



IMG_1961b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14422 Time(s)

IMG_1961b.JPG



IMG_2027b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14441 Time(s)

IMG_2027b.JPG



IMG_2013b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14404 Time(s)

IMG_2013b.JPG



IMG_1914b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14413 Time(s)

IMG_1914b.JPG



IMG_1938b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14436 Time(s)

IMG_1938b.JPG



IMG_1925b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14413 Time(s)

IMG_1925b.JPG



IMG_2041b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14422 Time(s)

IMG_2041b.JPG



IMG_2067b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 60x46x42mm, xl=13mm
 Description:
 Viewed:  14441 Time(s)

IMG_2067b.JPG


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Fiebre Verde




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PostPosted: Jan 17, 2015 12:42    Post subject: Re: Collection of Fiebre Verde - Coscuez  

Clean crystal with strong saturation.
Host rock is black shale.



IMG_2164b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14381 Time(s)

IMG_2164b.JPG



IMG_2299b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14355 Time(s)

IMG_2299b.JPG



IMG_2315b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14369 Time(s)

IMG_2315b.JPG



IMG_2341b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14372 Time(s)

IMG_2341b.JPG



IMG_2168b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14374 Time(s)

IMG_2168b.JPG



IMG_2188b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14372 Time(s)

IMG_2188b.JPG



IMG_2193b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14356 Time(s)

IMG_2193b.JPG



IMG_2321b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14370 Time(s)

IMG_2321b.JPG



IMG_2214b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14390 Time(s)

IMG_2214b.JPG



IMG_2100b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14386 Time(s)

IMG_2100b.JPG



IMG_2112b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14370 Time(s)

IMG_2112b.JPG



IMG_2153b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x38x50mm, xl=11mm
 Description:
 Viewed:  14385 Time(s)

IMG_2153b.JPG


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Fiebre Verde




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PostPosted: Jan 22, 2015 07:10    Post subject: Re: Collection of Fiebre Verde - La Pita  

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.



IMG_0004b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9cm across, xls=20mm
 Description:
 Viewed:  14232 Time(s)

IMG_0004b.JPG



IMG_0072b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9cm across, xls=20mm
 Description:
 Viewed:  14236 Time(s)

IMG_0072b.JPG



IMG_0034b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9cm across, xls=20mm
 Description:
 Viewed:  14247 Time(s)

IMG_0034b.JPG



IMG_0043b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9cm across, xls=20mm
 Description:
 Viewed:  14246 Time(s)

IMG_0043b.JPG



IMG_0052b.JPG
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9cm across, xls=20mm
 Description:
 Viewed:  14254 Time(s)

IMG_0052b.JPG



IMG_0047b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9cm across, xls=20mm
 Description:
 Viewed:  14241 Time(s)

IMG_0047b.JPG


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PostPosted: Jan 24, 2015 03:41    Post subject: Re: Collection of Fiebre Verde - Chivor  

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.



IMG_0082b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x70mm, xl=18mm
 Description:
 Viewed:  14129 Time(s)

IMG_0082b.JPG



IMG_0127b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x70mm, xl=18mm
 Description:
 Viewed:  14144 Time(s)

IMG_0127b.JPG



IMG_0103b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x70mm, xl=18mm
 Description:
 Viewed:  14160 Time(s)

IMG_0103b.JPG


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PostPosted: Jan 24, 2015 15:51    Post subject: Re: Collection of Fiebre Verde - Chivor  

Matrix is pure white calcite.
Proper lighting combined with high shutter speed produce stunning colors and shades (last 2 images).



IMG_0152b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x40x95mm, xl=13mm
 Description:
 Viewed:  14071 Time(s)

IMG_0152b.JPG



IMG_0168b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x40x95mm, xl=13mm
 Description:
 Viewed:  14096 Time(s)

IMG_0168b.JPG



IMG_0180b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x40x95mm, xl=13mm
 Description:
 Viewed:  14097 Time(s)

IMG_0180b.JPG



IMG_0261b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x40x95mm, xl=13mm
 Description:
 Viewed:  14086 Time(s)

IMG_0261b.JPG


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PostPosted: Jan 25, 2015 13:29    Post subject: Re: Collection of Fiebre Verde - Chivor  

Light green crystal.
Host rock is black shale.



IMG_0270b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14042 Time(s)

IMG_0270b.JPG



IMG_0276b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14041 Time(s)

IMG_0276b.JPG



IMG_0280b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14048 Time(s)

IMG_0280b.JPG



IMG_0288b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14035 Time(s)

IMG_0288b.JPG



IMG_0301b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14052 Time(s)

IMG_0301b.JPG



IMG_0318b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14035 Time(s)

IMG_0318b.JPG



IMG_0319b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x50x40mm, xl=10mm
 Description:
 Viewed:  14042 Time(s)

IMG_0319b.JPG


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PostPosted: Jan 26, 2015 09:28    Post subject: Re: Collection of Fiebre Verde - Coscuez  

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.



IMG_0464b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 95x75x75mm, xl=15mm
 Description:
 Viewed:  13941 Time(s)

IMG_0464b.JPG



IMG_0384b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 95x75x75mm, xl=15mm
 Description:
 Viewed:  13967 Time(s)

IMG_0384b.JPG



IMG_0364b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 95x75x75mm, xl=15mm
 Description:
 Viewed:  13950 Time(s)

IMG_0364b.JPG



IMG_5138b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 95x75x75mm, xl=15mm
 Description:
 Viewed:  13960 Time(s)

IMG_5138b.JPG



IMG_5142b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 95x75x75mm, xl=15mm
 Description:
 Viewed:  13958 Time(s)

IMG_5142b.JPG


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PostPosted: Jan 28, 2015 08:02    Post subject: Re: Collection of Fiebre Verde - La Pita  

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.



IMG_0538b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13887 Time(s)

IMG_0538b.JPG



IMG_0532b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13842 Time(s)

IMG_0532b.JPG



IMG_0552b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13866 Time(s)

IMG_0552b.JPG



IMG_0560b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13865 Time(s)

IMG_0560b.JPG



IMG_0567b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13842 Time(s)

IMG_0567b.JPG



IMG_0578b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13861 Time(s)

IMG_0578b.JPG



IMG_0620b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13842 Time(s)

IMG_0620b.JPG



IMG_0635b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 100x50x70mm, largest xl=17mm
 Description:
 Viewed:  13872 Time(s)

IMG_0635b.JPG


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Mike Wood




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PostPosted: Jan 28, 2015 09:46    Post subject: Re: Collection of Fiebre Verde  

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

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Fiebre Verde




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PostPosted: Jan 28, 2015 10:58    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: Jan 28, 2015 16:55    Post subject: Re: Collection of Fiebre Verde - Polveros  

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.



IMG_0749b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13755 Time(s)

IMG_0749b.JPG



IMG_0726b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13747 Time(s)

IMG_0726b.JPG



IMG_0733b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13767 Time(s)

IMG_0733b.JPG



IMG_0777b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13765 Time(s)

IMG_0777b.JPG



IMG_0790b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13776 Time(s)

IMG_0790b.JPG



IMG_0762b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13752 Time(s)

IMG_0762b.JPG



IMG_0774b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13737 Time(s)

IMG_0774b.JPG



IMG_0769b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13742 Time(s)

IMG_0769b.JPG



IMG_0798b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13745 Time(s)

IMG_0798b.JPG



IMG_0806b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13759 Time(s)

IMG_0806b.JPG



IMG_0824b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
 Viewed:  13765 Time(s)

IMG_0824b.JPG



IMG_0839b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x45mm, xl=34mm
 Description:
Spectacular contact deformity
 Viewed:  13741 Time(s)

IMG_0839b.JPG


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Fiebre Verde




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PostPosted: Jan 29, 2015 17:02    Post subject: Re: Collection of Fiebre Verde - Peñas Blancas  

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.



IMG_0841b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 78x47x31mm
 Description:
 Viewed:  13603 Time(s)

IMG_0841b.JPG



IMG_0874b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 78x47x31mm
 Description:
 Viewed:  13603 Time(s)

IMG_0874b.JPG



IMG_0852b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 78x47x31mm - Detail
 Description:
 Viewed:  13602 Time(s)

IMG_0852b.JPG



IMG_0882b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 78x47x31mm - Detail
 Description:
 Viewed:  13594 Time(s)

IMG_0882b.JPG



IMG_0869b.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 78x47x31mm - Detail
 Description:
 Viewed:  13614 Time(s)

IMG_0869b.JPG


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PostPosted: Jan 31, 2015 14:46    Post subject: Re: Collection of Fiebre Verde - Polveros  

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).



IMG_0895b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13534 Time(s)

IMG_0895b.JPG



IMG_1001b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13508 Time(s)

IMG_1001b.JPG



IMG_1007b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13512 Time(s)

IMG_1007b.JPG



IMG_0989b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13531 Time(s)

IMG_0989b.JPG



IMG_0963b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13509 Time(s)

IMG_0963b.JPG



IMG_1010b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13514 Time(s)

IMG_1010b.JPG



IMG_1044b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13536 Time(s)

IMG_1044b.JPG



IMG_1083b.JPG
 Mineral: Beryl (variety emerald), Calcite, Quartz
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x51x40mm, xl=9mm
 Description:
 Viewed:  13545 Time(s)

IMG_1083b.JPG


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PostPosted: Jan 31, 2015 16:51    Post subject: Re: Collection of Fiebre Verde  

'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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PostPosted: Feb 01, 2015 08:35    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: Feb 01, 2015 11:04    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: Feb 01, 2015 12:06    Post subject: Re: Collection of Fiebre Verde - Chivor  

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.



IMG_1238sb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 85x65x40mm, cluster=32x19mm
 Description:
 Viewed:  13404 Time(s)

IMG_1238sb.JPG



IMG_1136sb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 85x65x40mm, cluster=32x19mm
 Description:
 Viewed:  13368 Time(s)

IMG_1136sb.JPG



IMG_1143sb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 85x65x40mm, cluster=32x19mm
 Description:
 Viewed:  13377 Time(s)

IMG_1143sb.JPG



IMG_1122sb2.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 85x65x40mm, cluster=32x19mm
 Description:
 Viewed:  13408 Time(s)

IMG_1122sb2.JPG



IMG_1134sb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 85x65x40mm, cluster=32x19mm
 Description:
 Viewed:  13379 Time(s)

IMG_1134sb.JPG



IMG_1213sb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 85x65x40mm, cluster=32x19mm
 Description:
 Viewed:  13417 Time(s)

IMG_1213sb.JPG



IMG_1244b.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Albite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: Detail, FOV=2cm
 Description:
Albite? Calcite?
 Viewed:  13418 Time(s)

IMG_1244b.JPG


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PostPosted: Feb 02, 2015 11:56    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: Feb 02, 2015 15:38    Post subject: Re: Collection of Fiebre Verde  

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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