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Collection of Fiebre Verde
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Fiebre Verde




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PostPosted: Mar 24, 2016 14:31    Post subject: Re: Collection of Fiebre Verde  

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




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PostPosted: Mar 25, 2016 06:30    Post subject: Re: Collection of Fiebre Verde - Muzo (#461)  

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).



IMG_8558nb.JPG
 Mineral: Beryl (variety emerald), Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20x11mm
 Description:
 Viewed:  14859 Time(s)

IMG_8558nb.JPG



IMG_8532nb.JPG
 Mineral: Beryl (variety emerald), Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20x11mm
 Description:
 Viewed:  14884 Time(s)

IMG_8532nb.JPG



IMG_8589nb.JPG
 Mineral: Beryl (variety emerald), Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20x11mm
 Description:
 Viewed:  14872 Time(s)

IMG_8589nb.JPG


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Fiebre Verde




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PostPosted: Mar 26, 2016 09:51    Post subject: Re: Collection of Fiebre Verde - Peñas Blancas (#232)  

A common Peñas Blancas association of white and iron-stained calcite.
Only quartz is missing!



IMG_8650nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32x28x31mm, xl=14mm
 Description:
 Viewed:  14784 Time(s)

IMG_8650nb.JPG



IMG_8696nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32x28x31mm, xl=14mm
 Description:
 Viewed:  14790 Time(s)

IMG_8696nb.JPG



IMG_8665nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32x28x31mm, xl=14mm
 Description:
 Viewed:  14782 Time(s)

IMG_8665nb.JPG



IMG_8642nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32x28x31mm, xl=14mm
 Description:
 Viewed:  14848 Time(s)

IMG_8642nb.JPG


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Fiebre Verde




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PostPosted: Mar 28, 2016 14:45    Post subject: Re: Collection of Fiebre Verde - Chivor (#416)  

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.



IMG_8731nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14736 Time(s)

IMG_8731nb.JPG



IMG_8747nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14775 Time(s)

IMG_8747nb.JPG



IMG_8741nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14736 Time(s)

IMG_8741nb.JPG



IMG_8754nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14746 Time(s)

IMG_8754nb.JPG



IMG_8862nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14728 Time(s)

IMG_8862nb.JPG



IMG_8773nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14745 Time(s)

IMG_8773nb.JPG



IMG_8800nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14748 Time(s)

IMG_8800nb.JPG



IMG_8814nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14740 Time(s)

IMG_8814nb.JPG



IMG_8829nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
 Viewed:  14759 Time(s)

IMG_8829nb.JPG



IMG_8839nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 30x28x27mm, xl=17x8.5mm
 Description:
Iridescent dolomite.
 Viewed:  14772 Time(s)

IMG_8839nb.JPG


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Fiebre Verde




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PostPosted: Mar 30, 2016 16:21    Post subject: Re: Collection of Fiebre Verde - Muzo (#444)  

2 beryl crystals in a coal-black matrix.


IMG_8892nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
 Viewed:  14733 Time(s)

IMG_8892nb.JPG



IMG_8906nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
 Viewed:  14699 Time(s)

IMG_8906nb.JPG



IMG_8923nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
 Viewed:  14673 Time(s)

IMG_8923nb.JPG



IMG_8933nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
 Viewed:  14679 Time(s)

IMG_8933nb.JPG



IMG_8942nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
 Viewed:  14727 Time(s)

IMG_8942nb.JPG



IMG_8951nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
Both crystals exhibit complex dissolution patterns on their faces.
 Viewed:  14730 Time(s)

IMG_8951nb.JPG



IMG_8962nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x20x32mm, xls=10 & 7.5mm
 Description:
xl=7.5mm
 Viewed:  14723 Time(s)

IMG_8962nb.JPG


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Fiebre Verde




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PostPosted: Apr 01, 2016 05:59    Post subject: Re: Collection of Fiebre Verde - Chivor (#417)  

The large contact area does not seem to affect much the glowing effect of this crystal.
Host rock is black shale.



IMG_8994nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x24x24mm, xl=15x8mm
 Description:
 Viewed:  14642 Time(s)

IMG_8994nb.JPG



IMG_9065nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x24x24mm, xl=15x8mm
 Description:
 Viewed:  14610 Time(s)

IMG_9065nb.JPG



IMG_9086nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x24x24mm, xl=15x8mm
 Description:
 Viewed:  14639 Time(s)

IMG_9086nb.JPG



IMG_9034nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x24x24mm, xl=15x8mm
 Description:
 Viewed:  14617 Time(s)

IMG_9034nb.JPG



IMG_9008nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 43x24x24mm, xl=15x8mm
 Description:
 Viewed:  14649 Time(s)

IMG_9008nb.JPG


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Fiebre Verde




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PostPosted: Apr 02, 2016 08:11    Post subject: Re: Collection of Fiebre Verde - Polveros (#245)  

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.



IMG_9110nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: main xl=18x4.5mm
 Description:
Note the large and deep contact area at the base of the main crystal.
 Viewed:  14610 Time(s)

IMG_9110nb.JPG



IMG_9094nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: main xl=18x4.5mm
 Description:
 Viewed:  14656 Time(s)

IMG_9094nb.JPG



IMG_9132nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: main xl=18x4.5mm
 Description:
 Viewed:  14579 Time(s)

IMG_9132nb.JPG


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Fiebre Verde




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PostPosted: Apr 03, 2016 05:11    Post subject: Re: Collection of Fiebre Verde - Chivor (#501)  

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.



IMG_9209nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14509 Time(s)

IMG_9209nb.JPG



IMG_9226nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14508 Time(s)

IMG_9226nb.JPG



IMG_9206nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14497 Time(s)

IMG_9206nb.JPG



IMG_9195nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
The base of the aggregate is heavily included with carbonaceous impurities.
 Viewed:  14557 Time(s)

IMG_9195nb.JPG



IMG_9281nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14508 Time(s)

IMG_9281nb.JPG



IMG_9275nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14491 Time(s)

IMG_9275nb.JPG



IMG_9311nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14500 Time(s)

IMG_9311nb.JPG



IMG_9247nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14520 Time(s)

IMG_9247nb.JPG



IMG_4859nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: aggregate=18x13mm
 Description:
 Viewed:  14536 Time(s)

IMG_4859nb.JPG


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Fiebre Verde




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PostPosted: Apr 04, 2016 16:39    Post subject: Re: Collection of Fiebre Verde - Cunas (#263)  

From Polveros to Cunas.
Host rock is black shale.



IMG_9412nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 41x31x25mm, xl=17mm
 Description:
 Viewed:  14399 Time(s)

IMG_9412nb.JPG



IMG_9368nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 41x31x25mm, xl=17mm
 Description:
 Viewed:  14382 Time(s)

IMG_9368nb.JPG



IMG_9345nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 41x31x25mm, xl=17mm
 Description:
 Viewed:  14380 Time(s)

IMG_9345nb.JPG



IMG_9390nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 41x31x25mm, xl=17mm
 Description:
 Viewed:  14408 Time(s)

IMG_9390nb.JPG



IMG_9350nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 41x31x25mm, xl=17mm
 Description:
 Viewed:  14387 Time(s)

IMG_9350nb.JPG



IMG_9358nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 41x31x25mm, xl=17mm
 Description:
 Viewed:  14446 Time(s)

IMG_9358nb.JPG


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Pierre Joubert




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PostPosted: Apr 05, 2016 01:00    Post subject: Re: Collection of Fiebre Verde  

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




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PostPosted: Apr 05, 2016 09:43    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: Apr 05, 2016 12:17    Post subject: Re: Collection of Fiebre Verde - Polveros (#39)  

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.



IMG_9435nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x30x33mm, xl=9x6mm
 Description:
 Viewed:  14264 Time(s)

IMG_9435nb.JPG



IMG_9488nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x30x33mm, xl=9x6mm
 Description:
 Viewed:  14246 Time(s)

IMG_9488nb.JPG



IMG_9542nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x30x33mm, xl=9x6mm
 Description:
 Viewed:  14297 Time(s)

IMG_9542nb.JPG



IMG_9512nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x30x33mm, xl=9x6mm
 Description:
Dolomite & Calcite
 Viewed:  14271 Time(s)

IMG_9512nb.JPG



IMG_9563nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x30x33mm, xl=9x6mm
 Description:
Spectacular iridescent dolomite.
 Viewed:  14284 Time(s)

IMG_9563nb.JPG


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Fiebre Verde




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PostPosted: Apr 06, 2016 13:35    Post subject: Re: Collection of Fiebre Verde - La Pita (#149)  

Another specimen from La Pita.
Iridescent calcite this time (last image).
Host rock is black shale.



IMG_9594nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x40x35mm, xl=22mm
 Description:
 Viewed:  14151 Time(s)

IMG_9594nb.JPG



IMG_9663nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x40x35mm, xl=22mm
 Description:
 Viewed:  14142 Time(s)

IMG_9663nb.JPG



IMG_9631nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x40x35mm, xl=22mm
 Description:
 Viewed:  14194 Time(s)

IMG_9631nb.JPG



IMG_9622nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x40x35mm, xl=22mm
 Description:
Iridescent calcite
 Viewed:  14194 Time(s)

IMG_9622nb.JPG


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Fiebre Verde




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PostPosted: Apr 07, 2016 16:11    Post subject: Re: Collection of Fiebre Verde - Panjshir (#240)  

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.



IMG_9695nb.JPG
 Mineral: Beryl (variety emerald), Pyrite
 Locality:
Kamar Safed, Bazarak District, Panjsher Province, Afghanistan
 Dimensions: 40x28x22mm, xl=11x7mm
 Description:
 Viewed:  14038 Time(s)

IMG_9695nb.JPG



IMG_9684nb.JPG
 Mineral: Beryl (variety emerald), Pyrite
 Locality:
Kamar Safed, Bazarak District, Panjsher Province, Afghanistan
 Dimensions: 40x28x22mm, xl=11x7mm
 Description:
 Viewed:  14058 Time(s)

IMG_9684nb.JPG



IMG_9705nb.JPG
 Mineral: Beryl (variety emerald), Pyrite
 Locality:
Kamar Safed, Bazarak District, Panjsher Province, Afghanistan
 Dimensions: 40x28x22mm, xl=11x7mm
 Description:
 Viewed:  14061 Time(s)

IMG_9705nb.JPG



IMG_9717nb.JPG
 Mineral: Beryl (variety emerald), Pyrite
 Locality:
Kamar Safed, Bazarak District, Panjsher Province, Afghanistan
 Dimensions: 40x28x22mm, xl=11x7mm
 Description:
 Viewed:  14023 Time(s)

IMG_9717nb.JPG



IMG_9726nb.JPG
 Mineral: Beryl (variety emerald), Pyrite
 Locality:
Kamar Safed, Bazarak District, Panjsher Province, Afghanistan
 Dimensions: 40x28x22mm, xl=11x7mm
 Description:
 Viewed:  14073 Time(s)

IMG_9726nb.JPG


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Fiebre Verde




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PostPosted: Apr 09, 2016 17:20    Post subject: Re: Collection of Fiebre Verde - Chivor (#393)  

Aggregate from Chivor on a snowy white albite matrix.


IMG_9755nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35x23x11mm, aggregate=15x21mm
 Description:
 Viewed:  13975 Time(s)

IMG_9755nb.JPG


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Fiebre Verde




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PostPosted: Apr 10, 2016 13:53    Post subject: Re: Collection of Fiebre Verde - La Pita (#385)  

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.



IMG_9789nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13878 Time(s)

IMG_9789nb.JPG



IMG_9775nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13873 Time(s)

IMG_9775nb.JPG



IMG_9772nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13890 Time(s)

IMG_9772nb.JPG



IMG_9822nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13870 Time(s)

IMG_9822nb.JPG



IMG_9840nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13877 Time(s)

IMG_9840nb.JPG



IMG_9899nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13868 Time(s)

IMG_9899nb.JPG



IMG_9886nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13883 Time(s)

IMG_9886nb.JPG



IMG_9877nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13876 Time(s)

IMG_9877nb.JPG



IMG_9864nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x34x10mm, xl=10x4.5mm
 Description:
 Viewed:  13911 Time(s)

IMG_9864nb.JPG


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Fiebre Verde




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PostPosted: Apr 11, 2016 14:08    Post subject: Re: Collection of Fiebre Verde - Coscuez (#346)  

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.



IMG_9915nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 21x30x15mm
 Description:
 Viewed:  13795 Time(s)

IMG_9915nb.JPG



IMG_9929nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 21x30x15mm
 Description:
 Viewed:  13803 Time(s)

IMG_9929nb.JPG



IMG_9937nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 21x30x15mm
 Description:
 Viewed:  13831 Time(s)

IMG_9937nb.JPG



IMG_9943nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 21x30x15mm
 Description:
 Viewed:  13799 Time(s)

IMG_9943nb.JPG



IMG_9967nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 21x30x15mm
 Description:
 Viewed:  13834 Time(s)

IMG_9967nb.JPG


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Fiebre Verde




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PostPosted: Apr 12, 2016 15:15    Post subject: Re: Collection of Fiebre Verde - Chivor (#459)  

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.



IMG_9980nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 58x28x42mm, xl=11x4.5mm
 Description:
 Viewed:  13709 Time(s)

IMG_9980nb.JPG



IMG_9992nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 58x28x42mm, xl=11x4.5mm
 Description:
 Viewed:  13723 Time(s)

IMG_9992nb.JPG



IMG_0102nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 58x28x42mm, xl=11x4.5mm
 Description:
 Viewed:  13712 Time(s)

IMG_0102nb.JPG



IMG_0065nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 58x28x42mm, xl=11x4.5mm
 Description:
 Viewed:  13706 Time(s)

IMG_0065nb.JPG



IMG_0030nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 58x28x42mm, xl=11x4.5mm
 Description:
 Viewed:  13720 Time(s)

IMG_0030nb.JPG



IMG_0038nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 58x28x42mm, xl=11x4.5mm
 Description:
 Viewed:  13782 Time(s)

IMG_0038nb.JPG


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Jamison Brizendine




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PostPosted: Apr 13, 2016 07:50    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: Apr 13, 2016 16:16    Post subject: Re: Collection of Fiebre Verde  

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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