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Collection of Fiebre Verde
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Bergur_E_Sigurdarson




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PostPosted: Dec 19, 2019 16:59    Post subject: Re: Collection of Fiebre Verde  

A lot easier to give comments on specimens seen in person than of photos obviously.
I would venture a guess on the lustrous brown crystals to be grey dolomite, just with some iron staining and even micro-inclusions of ferrous types.

I have seen several times in the matrix from Chivor area that under UV glow some crystals in pink... I presume these to be fluorapatite, just that they are either faded or never got their pale pink colour.
It is excellent to see a sample that has nicely formed crystals of color next to the emerald crystals themselves :-)
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Fiebre Verde




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PostPosted: Dec 21, 2019 15:40    Post subject: Re: Collection of Fiebre Verde - Chivor (#766)  

Here is an oddity from Chivor - a dome-like crystal which has been contacted from all sides.
The upper crystal (image 1994) is also showing multiple contact areas.
Host rock is black shale.



IMG_1978nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 36mm x 45mm x 37mm, xls=13 & 5mm
 Description:
 Viewed:  1162 Time(s)

IMG_1978nb.JPG



IMG_1994nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 36mm x 45mm x 37mm, xls=13 & 5mm
 Description:
 Viewed:  1162 Time(s)

IMG_1994nb.JPG



IMG_1990nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 36mm x 45mm x 37mm, xls=13 & 5mm
 Description:
 Viewed:  1162 Time(s)

IMG_1990nb.JPG



IMG_2014nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 36mm x 45mm x 37mm, xls=13 & 5mm
 Description:
 Viewed:  1165 Time(s)

IMG_2014nb.JPG


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Fiebre Verde




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PostPosted: Dec 25, 2019 16:51    Post subject: Re: Collection of Fiebre Verde - Polveros (#768)  

Glowing translucent (striated) calcite matrix included with carbonaceous material.
Patches of black shale on the back.



IMG_2238nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 39mm x 32mm x 21mm, xl=12mm
 Description:
 Viewed:  1082 Time(s)

IMG_2238nb.JPG



IMG_2203nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Polveros Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 39mm x 32mm x 21mm, xl=12mm
 Description:
 Viewed:  1084 Time(s)

IMG_2203nb.JPG


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Fiebre Verde




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PostPosted: Dec 26, 2019 17:53    Post subject: Re: Collection of Fiebre Verde - Muzo (#8825)  

Not everything is green in Muzo.


Muzo.JPG
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Description:
 Viewed:  1023 Time(s)

Muzo.JPG



IMG_2367nb.JPG
 Mineral: Quartz, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 72mm x 72mm x 46mm
 Description:
 Viewed:  1025 Time(s)

IMG_2367nb.JPG


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Fiebre Verde




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PostPosted: Dec 27, 2019 14:44    Post subject: Re: Collection of Fiebre Verde - Coscuez (#769)  

Catching up on my backlog of photos...
Here is a nice little specimen from Coscuez.



IMG_2437nb.JPG
 Mineral: Beryl (variety emerald), Dolomite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 14mm x 15mm x 15mm, xl=15mm
 Description:
 Viewed:  966 Time(s)

IMG_2437nb.JPG


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Fiebre Verde




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PostPosted: Dec 29, 2019 10:38    Post subject: Re: Collection of Fiebre Verde - Gachalá (#773)  

The first emerald occurrence in the Gachalá area was incidentally found by a farmer of La Vega de San Juan in the early 1950s.
The farmer hid his discovery for a while but eventually confided in a friend about it.
It wasn't long before the word went round in all the emerald circles in Bogota and in 1953, 100s of adventurers dashed to the new bonanza. The Colombian government had to send in the army to take control and restore order.
Formal mining started in the late 50s.
That's how this new emerald district of the Eastern Belt was born - a pretty classic story.

In Gachalá, emeralds occur in limonite or kaolin deposits in fractures which explains why in matrix specimens are difficult to obtain.

These 3 Gachalá specimens are among the most famous emerald specimens which have been found in Colombia:
'The Gachalá Emerald' found in La Vega de San Juan mine in 1967 – 5cm x 5cm x 5cm, 858 cts – On display at Smithsonian's Natural History Museum in Washington D.C.
'La Emilia' found in Las Cruces mine in 1969 – 7,025 cts – Current whereabouts unknown
'El Monstro' found in Las Cruces mine in 1986 – 16,020 cts, a monster of 3,204 grams!! Possibly the largest emerald crystal ever found – Current whereabouts unknown

Gachalá specimens are not easy to find these days and I am pretty happy to have this less than 3-carat crystal in my collection ;-)
Matrix is oxidized which prevents identifying associated minerals.



IMG_2255nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, El Toro Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca Department, Colombia
 Dimensions: 19mm x 19mm x 18mm, xl=8mm
 Description:
 Viewed:  881 Time(s)

IMG_2255nb.JPG



IMG_2288nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, El Toro Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca Department, Colombia
 Dimensions: 19mm x 19mm x 18mm, xl=8mm
 Description:
 Viewed:  880 Time(s)

IMG_2288nb.JPG



IMG_2271nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, El Toro Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca Department, Colombia
 Dimensions: 19mm x 19mm x 18mm, xl=8mm
 Description:
 Viewed:  885 Time(s)

IMG_2271nb.JPG


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Fiebre Verde




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PostPosted: Dec 30, 2019 12:16    Post subject: Re: Collection of Fiebre Verde - Chivor (#770)  

Still catching up on my photos...

On my last trip to Colombia, I was really lucky to find two specimens "fresh from the mine" (as they sometimes say before Christmas - it helps drawing customer's attention and adds a significant premium to the price which in turn helps cover Christmas expenses).
As there is currently a serious shortage of natural specimens, there is also plenty of "fresh from the lab" artwork available in the market (sold usually at the price of natural specimens).

Here is the first specimen (*not* artwork).
Semi-transparent beryl crystals with a typical Chivor bluish-green color standing on a white laminar albite matrix.

Second specimen is on the way ;-)



IMG_2536nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Albite (variety cleavelandite)
 Locality:
Chivor mining district, Porvenir Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 17mm x 12mm x 12mm, main xl=9mm
 Description:
 Viewed:  777 Time(s)

IMG_2536nb.JPG



IMG_2504nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Albite (variety cleavelandite)
 Locality:
Chivor mining district, Porvenir Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 17mm x 12mm x 12mm, main xl=9mm
 Description:
 Viewed:  782 Time(s)

IMG_2504nb.JPG



IMG_2487nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Albite (variety cleavelandite)
 Locality:
Chivor mining district, Porvenir Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 36mm x 17mm x 26mm, xl=6mm
 Description:
Colors are warmer with a black background - same lighting conditions
 Viewed:  780 Time(s)

IMG_2487nb.JPG


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Philippe Durand




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PostPosted: Dec 30, 2019 13:35    Post subject: Re: Collection of Fiebre Verde  

that is a cute thumbnail
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Fiebre Verde




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PostPosted: Dec 31, 2019 05:14    Post subject: Re: Collection of Fiebre Verde  

Philippe Durand wrote:
that is a cute thumbnail

Merci Philippe!
Yes, it was a very pleasant surprise to find these small samples considering there was close to nothing available in terms of good quality specimens.
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Fiebre Verde




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PostPosted: Jan 01, 2020 13:15    Post subject: Re: Collection of Fiebre Verde - Chivor (#771)  

This is the other specimen I was mentioning in my previous post.

Happy New Year to everyone!



IMG_2584nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Albite (variety cleavelandite)
 Locality:
Chivor mining district, Porvenir Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 19mm x 13mm x 20mm, main xl=9mm
 Description:
 Viewed:  633 Time(s)

IMG_2584nb.JPG



IMG_2613nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Albite (variety cleavelandite)
 Locality:
Chivor mining district, Porvenir Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 19mm x 13mm x 20mm, main xl=9mm
 Description:
 Viewed:  635 Time(s)

IMG_2613nb.JPG



IMG_2654nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Albite (variety cleavelandite)
 Locality:
Chivor mining district, Porvenir Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 19mm x 13mm x 20mm, main xl=9mm
 Description:
 Viewed:  638 Time(s)

IMG_2654nb.JPG


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Fiebre Verde




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PostPosted: Jan 07, 2020 04:33    Post subject: Re: Collection of Fiebre Verde - Chivor (#767)  

Chivor specimen from an old collection.
Calcite matrix with patches of black shale.



IMG_2139nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35mm x 38mm x 37mm, xl=5mm
 Description:
 Viewed:  496 Time(s)

IMG_2139nb.JPG



IMG_2041nb.JPG
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35mm x 38mm x 37mm, xl=5mm
 Description:
 Viewed:  503 Time(s)

IMG_2041nb.JPG



IMG_2067nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35mm x 38mm x 37mm, xl=5mm
 Description:
 Viewed:  501 Time(s)

IMG_2067nb.JPG


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Fiebre Verde




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PostPosted: Jan 14, 2020 16:22    Post subject: Re: Collection of Fiebre Verde - La Pita (#764)  

Rare crystal topped by an atypical pointed termination.
'Botella' (bottle in Spanish) is the local name given for this crystal form.
Emerald 'botellas' are only seen in La Pita.

I don't know what's the growth mechanism that triggers this crystal form.
Any idea?



IMG_3052nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9mm
 Description:
 Viewed:  345 Time(s)

IMG_3052nb.JPG



IMG_2997nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 9mm
 Description:
 Viewed:  343 Time(s)

IMG_2997nb.JPG


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Fiebre Verde




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PostPosted: Feb 16, 2020 12:22    Post subject: Re: Collection of Fiebre Verde - Chivor (#707)  

20+ aggregates of dioptase-green emeralds crystals.
Matrix is a fine-grained whitish albitite [albitized black shale] which takes the form a stratiform breccia containing some lenses of the original black shale.
In the upper part of the matrix, the red melange partially cemented by pyrite and iron-rich dolomite is actually ankerite (crumbly aspect).
Ankerite is a carbonate mineral which occurs as a product of hydrothermal deposition (and alteration) in the two Colombian emerald belts.
Associated with pyrite, calcite ankerite, on a fine-grained albitite matrix.



IMG_0412nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite, Ankerite
 Locality:
Chivor Mining District, Camoyo Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70mm x 94mm x 76mm
 Description:
 Viewed:  75 Time(s)

IMG_0412nb.JPG



IMG_9532nb.JPG
 Mineral: Beryl (variety emerald), Pyrite, Calcite, Ankerite
 Locality:
Chivor Mining District, Camoyo Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70mm x 94mm x 76mm
 Description:
 Viewed:  70 Time(s)

IMG_9532nb.JPG


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