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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Mar 24, 2016 14:31 Post subject: Re: Collection of Fiebre Verde |
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Tobi wrote: | Strange, but really awesome! |
... one of the many oddities of the less known district of Chivor! Thanks Tobi.
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Mar 25, 2016 06:30 Post subject: Re: Collection of Fiebre Verde - Muzo (#461) |
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2 intergrown beryl crystals with a pronounced grayish tone partly caused by black carbonaceous impurities.
Note the cloudy aspect of the inclusions at the very base of the main crystal.
The French call the emerald's inclusions its 'jardin' (garden).
Mineral: | Beryl (variety emerald), Dolomite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 20x11mm |
Description: |
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26637 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 20x11mm |
Description: |
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Viewed: |
26671 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 20x11mm |
Description: |
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26664 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Mar 26, 2016 09:51 Post subject: Re: Collection of Fiebre Verde - Peñas Blancas (#232) |
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A common Peñas Blancas association of white and iron-stained calcite.
Only quartz is missing!
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: | 32x28x31mm, xl=14mm |
Description: |
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Viewed: |
26584 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: | 32x28x31mm, xl=14mm |
Description: |
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26601 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: | 32x28x31mm, xl=14mm |
Description: |
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Viewed: |
26541 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: | 32x28x31mm, xl=14mm |
Description: |
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26646 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Mar 28, 2016 14:45 Post subject: Re: Collection of Fiebre Verde - Chivor (#416) |
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Iridescent dolomite is relatively common in the Colombian emerald districts.
What is less common is to see this feature on emeralds.
The flat basal termination of this crystal is actually not completely flat and iridescence occurs on 2 patches which are slightly tilted with regard to the c-axis termination.
Matrix is white calcite.
Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26505 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26538 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26499 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26534 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26516 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26495 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26551 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26519 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26561 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 30x28x27mm, xl=17x8.5mm |
Description: |
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Viewed: |
26533 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Mar 30, 2016 16:21 Post subject: Re: Collection of Fiebre Verde - Muzo (#444) |
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2 beryl crystals in a coal-black matrix.
Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
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Viewed: |
26539 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
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Viewed: |
26467 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
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Viewed: |
26417 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
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Viewed: |
26463 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
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Viewed: |
26527 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
Both crystals exhibit complex dissolution patterns on their faces. |
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26475 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 37x20x32mm, xls=10 & 7.5mm |
Description: |
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Viewed: |
26484 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 01, 2016 05:59 Post subject: Re: Collection of Fiebre Verde - Chivor (#417) |
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The large contact area does not seem to affect much the glowing effect of this 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: | 43x24x24mm, xl=15x8mm |
Description: |
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Viewed: |
26432 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: | 43x24x24mm, xl=15x8mm |
Description: |
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Viewed: |
26391 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: | 43x24x24mm, xl=15x8mm |
Description: |
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Viewed: |
26423 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: | 43x24x24mm, xl=15x8mm |
Description: |
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Viewed: |
26415 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: | 43x24x24mm, xl=15x8mm |
Description: |
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Viewed: |
26408 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 02, 2016 08:11 Post subject: Re: Collection of Fiebre Verde - Polveros (#245) |
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The La Pita district was named after the original La Pita mine which opened in 1997.
The Polveros mine opened shortly after and has produced fine specimens ever since.
The other mines, Cunas, Totumos, and Consorcio which are all separately owned make up a vast complex of interconnected shafts and galleries which has lead to endless disputes and conflicts.
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: | main xl=18x4.5mm |
Description: |
Note the large and deep contact area at the base of the main crystal. |
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Viewed: |
26384 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: | main xl=18x4.5mm |
Description: |
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Viewed: |
26562 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: | main xl=18x4.5mm |
Description: |
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Viewed: |
26366 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 03, 2016 05:11 Post subject: Re: Collection of Fiebre Verde - Chivor (#501) |
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Yet another oddity from Chivor.
Apart from its clarity, the interesting feature of this aggregate is the large notch in the upper part.
It does not show very clearly in the images but the internal faces of the notch are as glassy and smooth as the faces of the aggregate.
So could that be a weird growth feature or just a contact deformity that has recrystallized?
Host rock is black shale.
Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26314 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26243 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26252 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
The base of the aggregate is heavily included with carbonaceous impurities. |
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Viewed: |
26300 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26254 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26243 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26239 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26287 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | aggregate=18x13mm |
Description: |
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Viewed: |
26266 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 04, 2016 16:39 Post subject: Re: Collection of Fiebre Verde - Cunas (#263) |
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From Polveros to Cunas.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 41x31x25mm, xl=17mm |
Description: |
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Viewed: |
26141 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 41x31x25mm, xl=17mm |
Description: |
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Viewed: |
26098 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 41x31x25mm, xl=17mm |
Description: |
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Viewed: |
26133 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 41x31x25mm, xl=17mm |
Description: |
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Viewed: |
26175 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 41x31x25mm, xl=17mm |
Description: |
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Viewed: |
26122 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 41x31x25mm, xl=17mm |
Description: |
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Viewed: |
26162 Time(s) |
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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Posted: Apr 05, 2016 01:00 Post subject: Re: Collection of Fiebre Verde |
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Just so Beautiful!!! We love the rainbows too.
_________________ Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 05, 2016 09:43 Post subject: Re: Collection of Fiebre Verde |
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Pierre Joubert wrote: | Just so Beautiful!!! We love the rainbows too. |
Thanks for your kind message Pierre!
Another "rainbow" is on the way.
Gérard
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 05, 2016 12:17 Post subject: Re: Collection of Fiebre Verde - Polveros (#39) |
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Another spectacular "rainbow" effect from Polveros.
As I mentioned in a previous post, iridescent dolomite is quite common in both emerald belts. But some, like this one, are quite spectacular.
I was confused with the stepped cube crystal featured in IMG_9512nb and thought at first it was colorless fluorite but after close examination I am pretty convinced it is a dolomite rhomb.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x30x33mm, xl=9x6mm |
Description: |
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Viewed: |
25983 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x30x33mm, xl=9x6mm |
Description: |
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Viewed: |
25954 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x30x33mm, xl=9x6mm |
Description: |
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Viewed: |
26012 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x30x33mm, xl=9x6mm |
Description: |
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Viewed: |
25987 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite, Pyrite |
Locality: | La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x30x33mm, xl=9x6mm |
Description: |
Spectacular iridescent dolomite. |
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Viewed: |
25984 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 06, 2016 13:35 Post subject: Re: Collection of Fiebre Verde - La Pita (#149) |
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Another specimen from La Pita.
Iridescent calcite this time (last image).
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 55x40x35mm, xl=22mm |
Description: |
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Viewed: |
25878 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 55x40x35mm, xl=22mm |
Description: |
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Viewed: |
25829 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 55x40x35mm, xl=22mm |
Description: |
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Viewed: |
25885 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 55x40x35mm, xl=22mm |
Description: |
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Viewed: |
25863 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 07, 2016 16:11 Post subject: Re: Collection of Fiebre Verde - Panjshir (#240) |
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Let's have a small break from Colombia.
Well... not quite :-)
This Panjshir beryl has a tone that reminds of the famous Muzo deep green.
Matrix is a siliceous metasedimentary rock scattered with tiny pyrite nodules.
Emerald production in Afghanistan is erratic and never high. As a result it is difficult to get hold of any specimen from that country these days.
Mineral: | Beryl (variety emerald), Pyrite |
Locality: | Kamar Safed outcrop (Kamar Saphed), Khenj emerald area, Khenj District, Panjshir Province, Afghanistan | |
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Dimensions: | 40x28x22mm, xl=11x7mm |
Description: |
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Viewed: |
25723 Time(s) |
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Mineral: | Beryl (variety emerald), Pyrite |
Locality: | Kamar Safed outcrop (Kamar Saphed), Khenj emerald area, Khenj District, Panjshir Province, Afghanistan | |
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Dimensions: | 40x28x22mm, xl=11x7mm |
Description: |
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Viewed: |
25766 Time(s) |
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Mineral: | Beryl (variety emerald), Pyrite |
Locality: | Kamar Safed outcrop (Kamar Saphed), Khenj emerald area, Khenj District, Panjshir Province, Afghanistan | |
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Dimensions: | 40x28x22mm, xl=11x7mm |
Description: |
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Viewed: |
25771 Time(s) |
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Mineral: | Beryl (variety emerald), Pyrite |
Locality: | Kamar Safed outcrop (Kamar Saphed), Khenj emerald area, Khenj District, Panjshir Province, Afghanistan | |
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Dimensions: | 40x28x22mm, xl=11x7mm |
Description: |
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Viewed: |
25713 Time(s) |
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Mineral: | Beryl (variety emerald), Pyrite |
Locality: | Kamar Safed outcrop (Kamar Saphed), Khenj emerald area, Khenj District, Panjshir Province, Afghanistan | |
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Dimensions: | 40x28x22mm, xl=11x7mm |
Description: |
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Viewed: |
25731 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 09, 2016 17:20 Post subject: Re: Collection of Fiebre Verde - Chivor (#393) |
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Aggregate from Chivor on a snowy white albite matrix.
Mineral: | Beryl (variety emerald), Albite (variety cleavelandite) |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 35x23x11mm, aggregate=15x21mm |
Description: |
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25674 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 10, 2016 13:53 Post subject: Re: Collection of Fiebre Verde - La Pita (#385) |
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Calcite is unusually transparent and has a remarkable luster in this La Pita specimen. Some of these crystals are striated.
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: | 27x34x10mm, xl=10x4.5mm |
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25566 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: | 27x34x10mm, xl=10x4.5mm |
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25560 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: | 27x34x10mm, xl=10x4.5mm |
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25574 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: | 27x34x10mm, xl=10x4.5mm |
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25552 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: | 27x34x10mm, xl=10x4.5mm |
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25574 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: | 27x34x10mm, xl=10x4.5mm |
Description: |
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25564 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: | 27x34x10mm, xl=10x4.5mm |
Description: |
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25551 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: | 27x34x10mm, xl=10x4.5mm |
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25563 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: | 27x34x10mm, xl=10x4.5mm |
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25587 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 11, 2016 14:08 Post subject: Re: Collection of Fiebre Verde - Coscuez (#346) |
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This Coscuez specimen puzzles me.
If we assume these 2 half crystals were originally part of one single complete beryl crystal, I don't understand the mechanism which made them crack apart along the c-axis.
Cleavage in Beryl is poor and parallel to the base.
I am not sure either on the filling mineral id which has a strong pink cast.
And, oh yes, I don't think it's glued.
Mineral: | Beryl (variety emerald) |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 21x30x15mm |
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25486 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 21x30x15mm |
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25494 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 21x30x15mm |
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25499 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 21x30x15mm |
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25482 Time(s) |
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Mineral: | Beryl (variety emerald) |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 21x30x15mm |
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25500 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 12, 2016 15:15 Post subject: Re: Collection of Fiebre Verde - Chivor (#459) |
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Chivor, what else?
There are 2 generations of dolomite: aggregate of small (millimetric size) pale brownish rhombs covering a bed of white albite and isolated lustrous colorless crystals.
Can't figure out what's the light-brown aggregate formation also featured in this specimen. Possibly halloysite balls? (can be seen in all images).
Host rock is a grey limestone shale.
Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 58x28x42mm, xl=11x4.5mm |
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25435 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 58x28x42mm, xl=11x4.5mm |
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25433 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 58x28x42mm, xl=11x4.5mm |
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25400 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 58x28x42mm, xl=11x4.5mm |
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25426 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 58x28x42mm, xl=11x4.5mm |
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25390 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 58x28x42mm, xl=11x4.5mm |
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25469 Time(s) |
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Jamison Brizendine
Joined: 27 Feb 2014
Posts: 128
Location: Northeast Ohio
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Posted: Apr 13, 2016 07:50 Post subject: Re: Collection of Fiebre Verde |
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Gérard,
I love your unusual Coscuez emerald (IMG_9915nb.JPG)!
I have a PDF copy of Ron Ringsrud’s article on the Coscuez Mine, from Gems and Gemology. I took a quick glance, but he mentions that the Conscuez emeralds are often found in faults along the Lower Cretaceous Villeta Formation (120 - 130 ma). He mentions that the area has undergone both ductile and brittle deformation.
To me your poor emerald was tectonically fractured by extension, and then filled in with some calcite. I have seen many examples of photographs of “normal faults”, but this is the first example I’ve seen of a “normal fault” which shows a gem mineral as what is being offset. What a cool oddity!
References Cited:
Ringsrud, R., 1986, The Coscuez Mine: A major source of Colombian emeralds: Gems and Gemology, 22, p. 67-79.
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: Apr 13, 2016 16:16 Post subject: Re: Collection of Fiebre Verde |
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Jamison Brizendine wrote: | Gérard,
I love your unusual Coscuez emerald (IMG_9915nb.JPG)!
I have a PDF copy of Ron Ringsrud’s article on the Coscuez Mine, from Gems and Gemology. I took a quick glance, but he mentions that the Conscuez emeralds are often found in faults along the Lower Cretaceous Villeta Formation (120 - 130 ma). He mentions that the area has undergone both ductile and brittle deformation.
To me your poor emerald was tectonically fractured by extension, and then filled in with some calcite. I have seen many examples of photographs of “normal faults”, but this is the first example I’ve seen of a “normal fault” which shows a gem mineral as what is being offset. What a cool oddity!
References Cited:
Ringsrud, R., 1986, The Coscuez Mine: A major source of Colombian emeralds: Gems and Gemology, 22, p. 67-79. |
Jamison,
Thanks for appreciating that specimen.
I don't always choose specimens for their aesthetics and picked this one for its unusual crack orientation.
I like your structural interpretation approach - for sure that's a good example of a normal faulting but definitely not the type of 'outcrop' geology students are used to analyze on a geological field trip!
Ron's article is a key reference on Coscuez - thanks for pointing it out. I was just not expecting to find the expression of that extensional tectonics regime on a tiny beryl crystal!! I was just confused with the crack orientation - they are normally distributed perpendicular to the c-axis.
Gérard
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