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Collection of Fiebre Verde
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Philippe Durand




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PostPosted: May 20, 2016 00:15    Post subject: Re: Collection of Fiebre Verde  

I like the thin layer on pyrite under fushite on the close up photo;
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Fiebre Verde




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PostPosted: May 20, 2016 11:15    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: May 20, 2016 13:25    Post subject: Re: Collection of Fiebre Verde - Pauna (#8600)  

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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PostPosted: May 21, 2016 07:09    Post subject: Re: Collection of Fiebre Verde - Muzo (#587)  

Aggregate of prismatic crystals in parallel growth.
Several generations of calcite.
Host rock is black shale.



IMG_2212nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x90x85mm, aggregate=14x9mm
 Description:
 Viewed:  9348 Time(s)

IMG_2212nb.JPG



IMG_2086nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x90x85mm, aggregate=14x9mm
 Description:
 Viewed:  9309 Time(s)

IMG_2086nb.JPG



IMG_2120nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x90x85mm, aggregate=14x9mm
 Description:
 Viewed:  9308 Time(s)

IMG_2120nb.JPG



IMG_2172nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x90x85mm, aggregate=14x9mm
 Description:
 Viewed:  9313 Time(s)

IMG_2172nb.JPG



IMG_2190nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x90x85mm, aggregate=14x9mm
 Description:
 Viewed:  9326 Time(s)

IMG_2190nb.JPG



IMG_2140nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 65x90x85mm, aggregate=14x9mm
 Description:
 Viewed:  9316 Time(s)

IMG_2140nb.JPG


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Fiebre Verde




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PostPosted: May 22, 2016 12:54    Post subject: Re: Collection of Fiebre Verde - La Pita (#594)  

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.



IMG_2241nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 120x83x68mm, main xl=14mm
 Description:
 Viewed:  9251 Time(s)

IMG_2241nb.JPG



IMG_2247nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 120x83x68mm, main xl=14mm
 Description:
Opposite side.
 Viewed:  9252 Time(s)

IMG_2247nb.JPG



IMG_2260nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 120x83x68mm, main xl=14mm
 Description:
 Viewed:  9268 Time(s)

IMG_2260nb.JPG



IMG_2277nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 120x83x68mm, main xl=14mm
 Description:
 Viewed:  9265 Time(s)

IMG_2277nb.JPG



IMG_2285nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 120x83x68mm, main xl=14mm
 Description:
 Viewed:  9263 Time(s)

IMG_2285nb.JPG


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Philippe Durand




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PostPosted: May 22, 2016 13:23    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: May 22, 2016 16:21    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: May 23, 2016 12:23    Post subject: Re: Collection of Fiebre Verde - Chivor (#273)  

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).



IMG_1773nb.JPG
 Mineral: Beryl (variety emerald), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42mm across, xls up to 14mm
 Description:
 Viewed:  9167 Time(s)

IMG_1773nb.JPG



IMG_2532nb.JPG
 Mineral: Beryl (variety emerald), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42mm across, xls up to 14mm
 Description:
 Viewed:  9165 Time(s)

IMG_2532nb.JPG



IMG_1834nb.JPG
 Mineral: Beryl (variety emerald), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42mm across, xls up to 14mm
 Description:
Iridescent beryl.
 Viewed:  9175 Time(s)

IMG_1834nb.JPG



IMG_1849nb.JPG
 Mineral: Beryl (variety emerald), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42mm across, xls up to 14mm
 Description:
 Viewed:  9144 Time(s)

IMG_1849nb.JPG



IMG_2326nb.JPG
 Mineral: Beryl (variety emerald), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42mm across, xls up to 14mm
 Description:
 Viewed:  9162 Time(s)

IMG_2326nb.JPG



IMG_2349nb.JPG
 Mineral: Beryl (variety emerald), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42mm across, xls up to 14mm
 Description:
 Viewed:  9158 Time(s)

IMG_2349nb.JPG


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Philippe Durand




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PostPosted: May 23, 2016 14:00    Post subject: Re: Collection of Fiebre Verde  

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




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PostPosted: May 24, 2016 02:09    Post subject: Re: Collection of Fiebre Verde  

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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PostPosted: May 25, 2016 08:46    Post subject: Re: Collection of Fiebre Verde - N'Chwaning Rhodochrosite (#7011)  

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!



IMG_2616nb.JPG
 Mineral: Rhodochrosite, Manganite
 Locality:
N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 Dimensions: 55x50x20mm
 Description:
 Viewed:  9045 Time(s)

IMG_2616nb.JPG



IMG_2641nb.JPG
 Mineral: Rhodochrosite, Manganite
 Locality:
N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 Dimensions: 55x50x20mm
 Description:
 Viewed:  9060 Time(s)

IMG_2641nb.JPG



IMG_2648nb.JPG
 Mineral: Rhodochrosite, Manganite
 Locality:
N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 Dimensions: 55x50x20mm
 Description:
 Viewed:  9046 Time(s)

IMG_2648nb.JPG



IMG_2666nb.JPG
 Mineral: Rhodochrosite, Manganite
 Locality:
N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 Dimensions: 55x50x20mm
 Description:
 Viewed:  9034 Time(s)

IMG_2666nb.JPG



IMG_2675nb.JPG
 Mineral: Rhodochrosite, Manganite
 Locality:
N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 Dimensions: 55x50x20mm
 Description:
 Viewed:  9059 Time(s)

IMG_2675nb.JPG


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PostPosted: May 27, 2016 07:27    Post subject: Re: Collection of Fiebre Verde - Coscuez (#593)  

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!



IMG_2692nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x61x36mm
 Description:
Beryl aggregate is crystallized.
 Viewed:  8936 Time(s)

IMG_2692nb.JPG



IMG_2714nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x61x36mm
 Description:
Opposite side - Non-crystallized aggregate.
 Viewed:  8947 Time(s)

IMG_2714nb.JPG



IMG_2788nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x61x36mm
 Description:
 Viewed:  8948 Time(s)

IMG_2788nb.JPG



IMG_2834nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 53x61x36mm
 Description:
Aggregate has a step-like appearance, which is a relatively common feature in Coscuez.
 Viewed:  8945 Time(s)

IMG_2834nb.JPG


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PostPosted: May 28, 2016 08:49    Post subject: Re: Collection of Fiebre Verde - Coscuez (#590)  

A Coscuez beryl with complex growth features.
Host rock is black shale.



IMG_2401nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x41x19mm, xl=7mm
 Description:
 Viewed:  8857 Time(s)

IMG_2401nb.JPG



IMG_2398nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 27x41x19mm, xl=7mm
 Description:
 Viewed:  8877 Time(s)

IMG_2398nb.JPG


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PostPosted: May 29, 2016 12:27    Post subject: Re: Collection of Fiebre Verde - Chivor (#591)  

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!



IMG_2432nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8801 Time(s)

IMG_2432nb.JPG



IMG_2484nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8818 Time(s)

IMG_2484nb.JPG



IMG_2506nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8814 Time(s)

IMG_2506nb.JPG



IMG_2549nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8827 Time(s)

IMG_2549nb.JPG



IMG_2554nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8823 Time(s)

IMG_2554nb.JPG



IMG_2561nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8824 Time(s)

IMG_2561nb.JPG



IMG_2571nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8821 Time(s)

IMG_2571nb.JPG



IMG_2589nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8813 Time(s)

IMG_2589nb.JPG



IMG_2601nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Manantial Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 32mm across, main xl=9mm
 Description:
 Viewed:  8797 Time(s)

IMG_2601nb.JPG


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Tobi




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PostPosted: May 30, 2016 02:25    Post subject: Re: Collection of Fiebre Verde - Chivor (#591)  

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




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PostPosted: May 30, 2016 10:38    Post subject: Re: Collection of Fiebre Verde - Chivor (#591)  

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




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PostPosted: May 30, 2016 14:28    Post subject: Re: Collection of Fiebre Verde  

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




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PostPosted: May 30, 2016 15:53    Post subject: Re: Collection of Fiebre Verde  

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




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PostPosted: May 31, 2016 11:54    Post subject: Re: Collection of Fiebre Verde - Coscuez (#588)  

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.



IMG_2847nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Quartz
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: H:44mm x W:25mm
 Description:
 Viewed:  8602 Time(s)

IMG_2847nb.JPG



IMG_2901nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Quartz
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: H:44mm x W:25mm
 Description:
 Viewed:  8597 Time(s)

IMG_2901nb.JPG



IMG_2914nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite, Quartz
 Locality:
Coscuez mining district, Jerusalem Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: H:44mm x W:25mm
 Description:
Iridescent quartz.
 Viewed:  8598 Time(s)

IMG_2914nb.JPG


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Tobi




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PostPosted: May 31, 2016 13:03    Post subject: Re: Collection of Fiebre Verde - Coscuez (#588)  

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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