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Philippe Durand
Joined: 10 May 2016
Posts: 628
Location: Normandie
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Posted: May 20, 2016 00:15 Post subject: Re: Collection of Fiebre Verde |
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I like the thin layer on pyrite under fushite on the close up photo;
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 20, 2016 11:15 Post subject: Re: Collection of Fiebre Verde |
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Philippe Durand wrote: | I like the thin layer on pyrite under fushite on the close up photo; |
Yes, the presence of the bright pyrite illuminates the specimen.
Actually, I am not fully convinced it's fuchsite.
Being a variety of muscovite, fuchsite is expected to have a silky or pearly luster.
The green alveoli all have a vitreous luster, but the structure is clearly fibrous when looking perpendicular to the growth direction.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4904
Location: Barcelona
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Posted: May 20, 2016 13:25 Post subject: Re: Collection of Fiebre Verde - Pauna (#8600) |
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Fiebre Verde wrote: | ...Do you have any suggestion on what this could be outside fuchsite? Maybe I should have posted this in the What is it thread first… |
Yes, better in the "What is it? - Where is it from?". Re-start the topic there please. Thank you.
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 21, 2016 07:09 Post subject: Re: Collection of Fiebre Verde - Muzo (#587) |
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Aggregate of prismatic crystals in parallel growth.
Several generations of calcite.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x90x85mm, aggregate=14x9mm |
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25648 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x90x85mm, aggregate=14x9mm |
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25572 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x90x85mm, aggregate=14x9mm |
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25574 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x90x85mm, aggregate=14x9mm |
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25532 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x90x85mm, aggregate=14x9mm |
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25640 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 65x90x85mm, aggregate=14x9mm |
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25573 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 22, 2016 12:54 Post subject: Re: Collection of Fiebre Verde - La Pita (#594) |
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At first glance, this specimen looks like a bulky candle with melted wax all over.
It illustrates the brecciated nature of the emerald-bearing veins in the two Colombian emerald belts.
Several generations of calcite, lustrous grey dolomite, on black shale.
And, oh yes, that green mineral is definitely neither muscovite nor diopside.
Mineral: | Beryl (variety emerald), Calcite, Dolomite |
Locality: | La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 120x83x68mm, main xl=14mm |
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25509 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: | 120x83x68mm, main xl=14mm |
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25500 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: | 120x83x68mm, main xl=14mm |
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25525 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: | 120x83x68mm, main xl=14mm |
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25504 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: | 120x83x68mm, main xl=14mm |
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25497 Time(s) |
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Philippe Durand
Joined: 10 May 2016
Posts: 628
Location: Normandie
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Posted: May 22, 2016 13:23 Post subject: Re: Collection of Fiebre Verde |
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Hello
Perhaps, you have already answered elsewhere in the forum, and maybe you don't want do disclose any secrets, but where do you find all these green beauties (as they are so scarce). Directly in Colombia or through some specialized dealers here ?
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 22, 2016 16:21 Post subject: Re: Collection of Fiebre Verde |
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Philippe Durand wrote: | Hello
Perhaps, you have already answer else where in the forum, and may be you don t want do diclose any secret, but where do you find all theese green beauties (as they are so scarce)
directly in Colombia or threw some specialised dealers here ? |
Bonsoir Philippe
The boring story of my “secret” started in the late 90’s when my employer sent me to Venezuela for a long-term assignment.
During my posting in Caracas, I started visiting Colombia on a regular basis and quickly got addicted to their green variety of beryl.
At that time, La Pita had just started production and specimens were literally flooding the local market from all over Boyacá – not just La Pita but also Muzo, Coscuez and Chivor.
Supply was exceeding demand and there was no room for the fake specimens market to grow.
During these bonanza days, my main dilemma was to pick between so many available specimens without really understanding the difference between the average, the very good, and the best.
And as if all this was not enough, very few foreigners would take a chance to make the trip to Bogota since Colombia was still regarded as a high-risk destination.
Over all these years, I managed to learn some Spanish and established a fairly good relationship with the local dealers and brokers.
So to answer your question – probably half of my collection comes directly from Colombia and the other half was purchased at various European and U.S. mineral shows. Internet shopping accounts for less than 1% of the total.
The increasing scarcity of the Colombian production is affecting the whole local emerald industry these days. The supply of Colombian rough stones has never been so low in the past few years.
This situation not only fuels the fake specimens market but also drives up prices to ridiculous levels.
As a result most of the well-established dealers have gradually pulled away from the Colombian emerald mineral market, with the notable exception of the extreme high-end market.
Gérard
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 23, 2016 12:23 Post subject: Re: Collection of Fiebre Verde - Chivor (#273) |
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Another Colombian beryl specimen.
This could be from the Piedra de Chulo mine but I couldn't get this confirmed.
Tunnels (they are called "Corte" locally) are very often interconnected to each other (well, they are not supposed to!) which makes the locality identification very difficult even when talking to the miners.
So unless you're around when a major find is made, it is quite challenging to find out from which exact locality a specimen comes from. And if it's not a major find, you need to rely on your own skills or on word-of-mouth.
Beryl crystals are striated and exhibit a bluish caste with a strong green/blue-green pleochroism.
Iridescence can be observed on some beryl crystals (#IMG_1834).
Mineral: | Beryl (variety emerald), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 42mm across, xls up to 14mm |
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25443 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 42mm across, xls up to 14mm |
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25432 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 42mm across, xls up to 14mm |
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25455 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 42mm across, xls up to 14mm |
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25408 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 42mm across, xls up to 14mm |
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25390 Time(s) |
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Mineral: | Beryl (variety emerald), Dolomite, Pyrite |
Locality: | Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 42mm across, xls up to 14mm |
Description: |
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25403 Time(s) |
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Philippe Durand
Joined: 10 May 2016
Posts: 628
Location: Normandie
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Posted: May 23, 2016 14:00 Post subject: Re: Collection of Fiebre Verde |
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Thank you Gérard, that is very interesting;
As for the last one, at first sight , I would have said tourmaline due to the striations.
I don't remember ever seeing a beryl like that; it is a nice specimen.
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 24, 2016 02:09 Post subject: Re: Collection of Fiebre Verde |
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Philippe Durand wrote: | thank you Gérard,
that is very interesting;
for the last one, at first sight , I would have said tourmaline due to the striations.
I Don t remember a Beryl like that; it is a nice specimen |
Hello Philippe
Thanks for your comments.
Good point!
Striations and bluish-green cast are 2 characteristics that rarely mix in Colombian emeralds which is why I think this specimen might come from the Piedra de Chulo mine which has produced crystals with similar features 10-12 years ago.
Variety is what makes Colombian emeralds so different from their Brazilian, Zambian, Russian or even Afghan counterparts.
Their variations seem to be endless – color, tone, habit, structure, form, termination, surface growth features, corrosion patterns, clarity, color zoning, inclusions, associations…
When it comes to Colombian emeralds, we are still often biased by the image of the Muzo classic specimen – perfectly shaped first order prism with a glassy smooth and flat pinacoid.
There is nothing wrong with that representation but there is much more out there.
Gérard
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 25, 2016 08:46 Post subject: Re: Collection of Fiebre Verde - N'Chwaning Rhodochrosite (#7011) |
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Rhodochrosite featuring a manganite matrix (which does not appear in the photos) covered by ‘wheat sheaf’ clusters of pinkish-red crystals is not something you come across often these days.
This unusual habit displays a very attractive color zonation where the interior portion of an individual cluster displays a light pink core, while the exterior is covered by crystals that are bright pink to light cherry red.
The exterior of each cluster is formed by a multitude of tightly packed scalenohedral crystals that create the distinct ‘wheat sheaf’ look.
Same comment as Gail in her yesterday’s post… one of my favorites!
Mineral: | Rhodochrosite, Manganite |
Locality: | N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa | |
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Dimensions: | 55x50x20mm |
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25294 Time(s) |
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Mineral: | Rhodochrosite, Manganite |
Locality: | N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa | |
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Dimensions: | 55x50x20mm |
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25314 Time(s) |
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Mineral: | Rhodochrosite, Manganite |
Locality: | N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa | |
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Dimensions: | 55x50x20mm |
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25281 Time(s) |
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Mineral: | Rhodochrosite, Manganite |
Locality: | N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa | |
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Dimensions: | 55x50x20mm |
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25284 Time(s) |
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Mineral: | Rhodochrosite, Manganite |
Locality: | N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa | |
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Dimensions: | 55x50x20mm |
Description: |
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Viewed: |
25327 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 27, 2016 07:27 Post subject: Re: Collection of Fiebre Verde - Coscuez (#593) |
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Main hue in this Coscuez specimen is a vivid "grass-green" which is much less sought-after than the classic deep-green hue.
Personally, I like both.
Grass-green is more commonly found in the Western Belt (Mainly in La Pita but also in Muzo and Coscuez) than in the Eastern Belt.
Some patches of the crumbly grey shale host rock can be seen along the beryl aggregate.
In the last image, I tried to highlight the step-like appearance of the aggregate, which is a relatively common feature in Coscuez.
PS:
Am not sure it will be widely used, but could a site admin maybe add the following entry in the locality database? Many thanks!
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá
_____________________________________________________
Done.
Thank you!
Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x61x36mm |
Description: |
Beryl aggregate is crystallized. |
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25193 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x61x36mm |
Description: |
Opposite side - Non-crystallized aggregate. |
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25195 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x61x36mm |
Description: |
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25198 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 53x61x36mm |
Description: |
Aggregate has a step-like appearance, which is a relatively common feature in Coscuez. |
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25179 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 28, 2016 08:49 Post subject: Re: Collection of Fiebre Verde - Coscuez (#590) |
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A Coscuez beryl with complex growth features.
Host rock is black shale.
Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x41x19mm, xl=7mm |
Description: |
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25053 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite |
Locality: | Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 27x41x19mm, xl=7mm |
Description: |
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25056 Time(s) |
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 29, 2016 12:27 Post subject: Re: Collection of Fiebre Verde - Chivor (#591) |
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The exceptional clarity of the main crystal deserves the couple of extra images.
This specimen joined my collection recently and I am happy to share it with you.
Pyrite, grey dolomite rhombs, snowy white coarse-grained aggregate of albite, on a black shale host rock.
PS:
Sorry to bother the site admins again, but could the following entry be added in the locality database? Many thanks!
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá
_________________________________________________
Done
Thank you!
Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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24978 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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24990 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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Viewed: |
25060 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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25062 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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25042 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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25025 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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25040 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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Viewed: |
25013 Time(s) |
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Mineral: | Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite |
Locality: | Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | 32mm across, main xl=9mm |
Description: |
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Viewed: |
24985 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: May 30, 2016 02:25 Post subject: Re: Collection of Fiebre Verde - Chivor (#591) |
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Fiebre Verde wrote: | The exceptional clarity of the main crystal deserves the couple of extra images. This specimen joined my collection recently and I am happy to share it with you. | I think I'm not the only one here who is happy to see such an awesome gem. Exceptional, you say it! Wow. Simply wow :-)
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 30, 2016 10:38 Post subject: Re: Collection of Fiebre Verde - Chivor (#591) |
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Tobi wrote: | Fiebre Verde wrote: | The exceptional clarity of the main crystal deserves the couple of extra images. This specimen joined my collection recently and I am happy to share it with you. | I think I'm not the only one here who is happy to see such an awesome gem. Exceptional, you say it! Wow. Simply wow :-) |
Glad you appreciate it Tobi.
This specimen was presented to me towards the end of my stay in Bogota, just when I was starting to lose hope of finding something special.
Gérard
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Philippe Durand
Joined: 10 May 2016
Posts: 628
Location: Normandie
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Posted: May 30, 2016 14:28 Post subject: Re: Collection of Fiebre Verde |
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Gemmy emerald like this one are not so common, if I consider your collection and the last MR on this stone.
A nice catch, indeed.
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 30, 2016 15:53 Post subject: Re: Collection of Fiebre Verde |
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Philippe Durand wrote: | Gemmy emerald like this one are not so common, if I consider your collection and the last MR on this stone.
A nice catch, indeed. |
Thanks Philippe!
Not so common is to say the least.
The trademark signature of natural emeralds are fissures and inclusions.
Fissures can be treated with some cosmetic surgery (using oils, resins or polymers) but we haven't found (yet) a process that makes the inclusions and impurities invisible.
When none of these features can be seen by the naked eye, then you start wondering if it's real or not. So yes, it is that uncommon.
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 31, 2016 11:54 Post subject: Re: Collection of Fiebre Verde - Coscuez (#588) |
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From Chivor to Coscuez, from clarity to opacity.
Still an interesting specimen with water-clear quartz next to the beryl aggregate.
White calcite, pyrite, clear iridescent quartz, patches of crumbly grey shale.
Mineral: | Beryl (variety emerald), Calcite, Pyrite, Quartz |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | H:44mm x W:25mm |
Description: |
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Viewed: |
24746 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Quartz |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | H:44mm x W:25mm |
Description: |
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Viewed: |
24717 Time(s) |
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Mineral: | Beryl (variety emerald), Calcite, Pyrite, Quartz |
Locality: | Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia | |
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Dimensions: | H:44mm x W:25mm |
Description: |
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Viewed: |
24728 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: May 31, 2016 13:03 Post subject: Re: Collection of Fiebre Verde - Coscuez (#588) |
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Fiebre Verde wrote: | From clarity to opacity [...] still an interesting specimen [...] | Sure, gemminess is an important factor when judging the quality of certain minerals, if not THE factor when it's about gem minerals like beryl. From a jeweler's point of view, opaque specimens of emerald may seem worthless, but as a mineral collector, I think there are also wonderful specimens of that species that are opaque. When undamaged and in a nice shape, showing a vivid green colour, and combined with some contrasting matrix, an emerald doesn't need to be gemmy to look good. Gemminess is a bonus and increases the value enormously, but even opaque crystals can result in very desirable mineral specimens.
Just my humble opinion :-)
Tobi
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