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Collection of Fiebre Verde
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Fiebre Verde




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PostPosted: Sep 06, 2018 15:28    Post subject: Re: Collection of Fiebre Verde - La Pita (#343)  

Group of 10+ grass green crystals.
Host rock is a bedded limestone.



IMG_9610nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 59x40x41mm, largest xl=20mm
 Description:
 Viewed:  1794 Time(s)

IMG_9610nb.JPG


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Fiebre Verde




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PostPosted: Sep 15, 2018 15:23    Post subject: Re: Collection of Fiebre Verde - Muzo (#703)  

Beryl crystal partly encapsulated in a calcite shell.
Host rock is black shale.



IMG_8715nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 45x47x32mm, xl=15mm
 Description:
 Viewed:  1699 Time(s)

IMG_8715nb.JPG



IMG_8739nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 45x47x32mm, xl=15mm
 Description:
 Viewed:  1696 Time(s)

IMG_8739nb.JPG



IMG_8785nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 45x47x32mm, xl=15mm
 Description:
 Viewed:  1695 Time(s)

IMG_8785nb.JPG



IMG_8776nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 45x47x32mm, xl=15mm
 Description:
 Viewed:  1694 Time(s)

IMG_8776nb.JPG


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Fiebre Verde




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PostPosted: Sep 22, 2018 15:56    Post subject: Re: Collection of Fiebre Verde - Muzo (#707)  

Small beryl crystal has grown on top of the large one.


IMG_9627nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: xl=5.5x7x4.5mm
 Description:
 Viewed:  1547 Time(s)

IMG_9627nb.JPG



IMG_9658nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: xl=5.5x7x4.5mm
 Description:
 Viewed:  1543 Time(s)

IMG_9658nb.JPG


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Fiebre Verde




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PostPosted: Oct 03, 2018 15:11    Post subject: Re: Collection of Fiebre Verde - Chivor (#710]  

Beryl crystal has a complex pyramidal termination.


IMG_9715nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 4x10mm
 Description:
 Viewed:  1302 Time(s)

IMG_9715nb.JPG



IMG_9740nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 4x10mm
 Description:
 Viewed:  1301 Time(s)

IMG_9740nb.JPG


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Tobi




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PostPosted: Oct 07, 2018 04:09    Post subject: Re: Collection of Fiebre Verde  

Just too good to be true! Especially the one with the "baby" crystal attached to its top - what a beauty!
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Fiebre Verde




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PostPosted: Oct 07, 2018 09:34    Post subject: Re: Collection of Fiebre Verde  

Tobi wrote:
Just too good to be true! Especially the one with the "baby" crystal attached to its top - what a beauty!

Thanks Tobi!
These small crystals are sometime overlooked by dealers trying to go for the big sale.
The "big sale" wasn't that big at the end and I walked out with a lot of 4 small crystals as a bonus.
Gérard
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Fiebre Verde




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PostPosted: Oct 16, 2018 15:52    Post subject: Re: Collection of Fiebre Verde - Chivor (#688]  

Two intergrown crystals from Chivor.
Very likely from the historic mine of Palo Arañado.



IMG_9271nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: both crystals are 15mm long
 Description:
 Viewed:  1111 Time(s)

IMG_9271nb.JPG


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crosstimber
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PostPosted: Oct 17, 2018 09:39    Post subject: Re: Collection of Fiebre Verde - Chivor (#688]  

Fiebre Verde wrote:
Two intergrown crystals from Chivor.
Very likely from the historic mine of Palo Arañado.


Very nice Gérard.
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Fiebre Verde




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PostPosted: Oct 17, 2018 10:53    Post subject: Re: Collection of Fiebre Verde - Chivor (#688]  

crosstimber wrote:
Fiebre Verde wrote:
Two intergrown crystals from Chivor.
Very likely from the historic mine of Palo Arañado.


Very nice Gérard.

Thanks Michael!
These small specimens are sometimes overlooked in the Bogota market.
With a bit of patience and time, you can find some real treasures at a very reasonable price.
Gérard
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Fiebre Verde




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PostPosted: Oct 18, 2018 16:33    Post subject: Re: Collection of Fiebre Verde - Quartz with unknown fibrous inclusions (#8820]  

Colorless quartz cluster.
Terminations are heavily included with a vivid yellowish-orange material.
Crystals are double-terminated.
This material is from the early 2000s, from an unknown Colombian locality, either in the state of Santander or in Boyacá.
The dealer I got this specimen from believes that the yellowish-orange fibrous inclusions is Humboldtine.

In a recent post, John Rakovan mentioned that these inclusions were being analyzed by his team of the Miami University.
Eagerly waiting for an update on the nature of these inclusions :-)



IMG_9783nb.JPG
 Mineral: Quartz
 Locality:
Colombia
 Dimensions: 13x46x8mm
 Description:
 Viewed:  950 Time(s)

IMG_9783nb.JPG



IMG_9794nb.JPG
 Mineral: Quartz
 Locality:
Colombia
 Dimensions: 13x46x8mm
 Description:
 Viewed:  952 Time(s)

IMG_9794nb.JPG


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Bergur_E_Sigurdarson




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PostPosted: Oct 18, 2018 17:59    Post subject: Re: Collection of Fiebre Verde  

I have seen similar quartz in Colombia... usually told it's from Santander... whether correct or not.
But the ones I have seen aren't usually vivid yellow... the texture of the "fibers" or tubes is the same... but colour ranges from almost white to oxidized brown (similar to the dirt in btw many examples I have seen and bought a few) .... I had always assumed they were just "micro-tubes" getting filled with rust/dirt.
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Philippe Durand




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PostPosted: Oct 19, 2018 10:16    Post subject: Re: Collection of Fiebre Verde - Chivor (#688]  

Fiebre Verde wrote:
Two intergrown crystals from Chivor.
Very likely from the historic mine of Palo Arañado.


wouah ! Fabulous thumbnail
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Fiebre Verde




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PostPosted: Oct 19, 2018 12:14    Post subject: Re: Collection of Fiebre Verde - Chivor (#688]  

Philippe Durand wrote:
Fiebre Verde wrote:
Two intergrown crystals from Chivor.
Very likely from the historic mine of Palo Arañado.


wouah ! Fabulous thumbnail

Thanks for your appreciation Philippe!
Mother nature has certainly done a good job here.
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Fiebre Verde




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PostPosted: Oct 21, 2018 13:50    Post subject: Re: Collection of Fiebre Verde - Gachalá (#713]  

The Matecaña mine made the headlines 20 years ago after a pocket full of gastropods was discovered.
These were not ordinary fossils - their shells had been “pseudomorphosed” to emerald following the classic process of “mineralization by dissolution/substitution”
Never had a chance to have an emerald gastropod in my collection but I was lucky to get my first Matecaña specimen only a few days ago.
This druse of deep green crystals arranged in an “en echelon” form looks like a vein crossing the black shale.
But the unique feature of this vein is that outside the emerald, no other mineralization is seen. Contrast of the deep green color with the black shale is spectacular, much better in person.
I was told by a miner who works in the Gachalá area that the black shale found in Matecaña is extremely hard – probably due to the high concentration of silica.



IMG_9891nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, Matecaña Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 90x57x49mm
 Description:
 Viewed:  787 Time(s)

IMG_9891nb.JPG



IMG_9900nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, Matecaña Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 90x57x49mm
 Description:
 Viewed:  781 Time(s)

IMG_9900nb.JPG



IMG_9907nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, Matecaña Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 90x57x49mm
 Description:
 Viewed:  779 Time(s)

IMG_9907nb.JPG



IMG_9948nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Gachalá mining district, Matecaña Mine, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 90x57x49mm
 Description:
 Viewed:  782 Time(s)

IMG_9948nb.JPG


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Fiebre Verde




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PostPosted: Oct 29, 2018 16:34    Post subject: Re: Collection of Fiebre Verde - Chivor (#711)  

Hollow emerald, only found in the Chivor district.
It is admitted that crystals with a central hollow result from rapid growth.



IMG_9841nb.JPG
 Mineral: Beryl (variety emerald), Quartz
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: xl=11.5mm x 12mm
 Description:
 Viewed:  624 Time(s)

IMG_9841nb.JPG



IMG_9835nb.JPG
 Mineral: Beryl (variety emerald), Quartz
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: xl=11.5mm x 12mm
 Description:
 Viewed:  626 Time(s)

IMG_9835nb.JPG


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Fiebre Verde




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PostPosted: Oct 31, 2018 15:15    Post subject: Re: Collection of Fiebre Verde - Chivor (#712)  

Another hollow crystal from the Eastern Emerald Belt.
Hollow form is caused by rapid growth of the crystal.



IMG_9874nb1.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, El Oriente Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: xl=5x11mm
 Description:
 Viewed:  538 Time(s)

IMG_9874nb1.JPG


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Tobi




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PostPosted: Nov 02, 2018 03:17    Post subject: Re: Collection of Fiebre Verde - Gachalá (#713]  

Fiebre Verde wrote:
The Matecaña mine made the headlines 20 years ago after a pocket full of gastropods was discovered. These were not ordinary fossils - their shells had been “pseudomorphosed” to emerald following the classic process of “mineralization by dissolution/substitution” Never had a chance to have an emerald gastropod in my collection but I was lucky to get my first Matecaña specimen only a few days ago. This druse of deep green crystals arranged in an “en echelon” form looks like a vein crossing the black shale.
But the unique feature of this vein is that outside the emerald, no other mineralization is seen. Contrast of the deep green color with the black shale is spectacular, much better in person.
I was told by a miner who works in the Gachalá area that the black shale found in Matecaña is extremely hard – probably due to the high concentration of silica.
( https://www.mineral-forum.com/message-board/viewtopic.php?p=64443#64443 )

An unusual but outstandingly beautiful emerald specimen, congratulations!
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Fiebre Verde




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PostPosted: Nov 02, 2018 08:53    Post subject: Re: Collection of Fiebre Verde - Gachalá (#713]  

Tobi wrote:
Fiebre Verde wrote:
The Matecaña mine made the headlines 20 years ago after a pocket full of gastropods was discovered. These were not ordinary fossils - their shells had been “pseudomorphosed” to emerald following the classic process of “mineralization by dissolution/substitution” Never had a chance to have an emerald gastropod in my collection but I was lucky to get my first Matecaña specimen only a few days ago. This druse of deep green crystals arranged in an “en echelon” form looks like a vein crossing the black shale.
But the unique feature of this vein is that outside the emerald, no other mineralization is seen. Contrast of the deep green color with the black shale is spectacular, much better in person.
I was told by a miner who works in the Gachalá area that the black shale found in Matecaña is extremely hard – probably due to the high concentration of silica.
( https://www.mineral-forum.com/message-board/viewtopic.php?p=64443#64443 )

An unusual but outstandingly beautiful emerald specimen, congratulations!

Thanks for your appreciation Tobi!
This is a good illustration of the rich diversity of crystal forms found in the two Colombian emerald belts.
Had a long and tedious photo shooting session due to the ever-changing inclination and direction of the crystal faces.
Incidentally this was a (very) rare instance where I could quickly get a confirmation on the locality. It seems like this specimen came from a non-productive pocket and there was no reason to conceal the locality name.
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Fiebre Verde




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PostPosted: Nov 03, 2018 13:15    Post subject: Re: Collection of Fiebre Verde - Pink Fluorapatite (#6302)  

Pink Fluorapatite from La Marina is a relatively recent find.
Another desirable mineral found in this locality is the Euclase which is rarely seen in combination with the Fluorapatite.
A large pocket of Euclase was found in 2015 and some exceptional specimens could be seen in various US and European mineral shows in 2016.
As for the other local star of the beryllium minerals, it is yet to be found in La Marina, although this locality lies in the heart of the Western Emerald Belt.

The 2 groups of Fluorapatite stand on a druse of white laminar albite (partly iron-stained). Host rock is black shale.



IMG_9951nb.JPG
 Mineral: Fluorapatite, Albite (variety cleavelandite)
 Locality:
La Marina Mine, Municipio Pauna, Boyacá Department, Colombia
 Dimensions: 74x29x30mm - Size of the 2 Fluorapatite groups = 21x8mm & 9x9mm
 Description:
 Viewed:  365 Time(s)

IMG_9951nb.JPG


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Josele




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PostPosted: Nov 03, 2018 20:59    Post subject: Re: Collection of Fiebre Verde  

Lovely apatite Gérard, and from a unusual locality, thanks for sharing. It's a pleasure this pink touch in your green jungle.
Color and transparency reminds me some Baltistan apatites that are very fluorescent, especially under short wave. Have you checked fluorescence?
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