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Collection of Fiebre Verde
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Fiebre Verde




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PostPosted: Jun 11, 2018 01:50    Post subject: Re: Collection of Fiebre Verde - Coscuez (#697)  

Two generations of calcite, striated tabular form (common) and clear prismatic form (not so common)


IMG_7463nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 40x35x16mm, aggregate=10x15mm
 Description:
 Viewed:  1698 Time(s)

IMG_7463nb.JPG


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Fiebre Verde




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PostPosted: Jun 16, 2018 10:24    Post subject: Re: Collection of Fiebre Verde - Chivor (#692)  

Group of beryl crystals in a calcite matrix.
Though smaller than the Muzo ones, the Chivor stones often exhibit more sparkle.



IMG_7348nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x30x32mm, largest xl=10mm
 Description:
 Viewed:  1525 Time(s)

IMG_7348nb.JPG



IMG_7424nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 37x30x32mm, largest xl=10mm
 Description:
 Viewed:  1526 Time(s)

IMG_7424nb.JPG


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Fiebre Verde




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PostPosted: Jun 29, 2018 11:47    Post subject: Re: Collection of Fiebre Verde - Chivor (#702)  

Light-green beryl crystals on a marble-like calcite matrix mixed with patches of black shale.


IMG_7495nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 89x138x35mm, 15+ xls up to 10mm
 Description:
 Viewed:  1335 Time(s)

IMG_7495nb.JPG



IMG_7517nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 89x138x35mm, 15+ xls up to 10mm
 Description:
 Viewed:  1334 Time(s)

IMG_7517nb.JPG


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Fiebre Verde




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PostPosted: Jul 06, 2018 05:18    Post subject: Re: Collection of Fiebre Verde - Cunas (#699)  

From Cunas,
Well crystallized dolomite, calcite, clear quartz.



IMG_7250nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Quartz
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42x24x23mm, xls=8mm
 Description:
 Viewed:  1202 Time(s)

IMG_7250nb.JPG



IMG_7257nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Quartz
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 42x24x23mm, xls=8mm
 Description:
 Viewed:  1202 Time(s)

IMG_7257nb.JPG


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Fiebre Verde




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PostPosted: Jul 09, 2018 13:03    Post subject: Re: Collection of Fiebre Verde - Chivor (#698)  

Host rock is black shale.


IMG_7303nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 39x36x18mm, xl=7mm
 Description:
 Viewed:  1042 Time(s)

IMG_7303nb.JPG



IMG_7333nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 39x36x18mm, xl=7mm
 Description:
 Viewed:  1040 Time(s)

IMG_7333nb.JPG



IMG_7322nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 39x36x18mm, xl=7mm
 Description:
 Viewed:  1039 Time(s)

IMG_7322nb.JPG


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Fiebre Verde




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PostPosted: Jul 13, 2018 08:10    Post subject: Re: Collection of Fiebre Verde - Coscuez (#694)  

Coscuez specimen with ~15 thin elongated beryl crystals on a calcite + dolomite matrix.


IMG_7533nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 51x39x33mm, xls up to 12mm
 Description:
 Viewed:  887 Time(s)

IMG_7533nb.JPG



IMG_7559nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 51x39x33mm, xls up to 12mm
 Description:
 Viewed:  887 Time(s)

IMG_7559nb.JPG


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Pierre Joubert




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PostPosted: Jul 13, 2018 09:07    Post subject: Re: Collection of Fiebre Verde  

I like this last specimen!
_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
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Fiebre Verde




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PostPosted: Jul 13, 2018 17:23    Post subject: Re: Collection of Fiebre Verde  

Pierre Joubert wrote:
I like this last specimen!

I'm glad you like it Pierre!
Coscuez has a wide variety of crystal forms - elongated prisms are certainly not the most common form.
Gérard
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Fiebre Verde




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PostPosted: Jul 17, 2018 06:08    Post subject: Re: Collection of Fiebre Verde - Chivor (#370)  

Laminar albite, pyrite, dolomite, on black shale.


IMG_8345nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 40x43x34mm, xl=15mm
 Description:
 Viewed:  731 Time(s)

IMG_8345nb.JPG


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Fiebre Verde




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PostPosted: Jul 22, 2018 08:53    Post subject: Re: Collection of Fiebre Verde - Chivor (#704)  

Translucent crystal from Palo Arañado.
Weathered pyrite and calcite on black shale.



IMG_8803nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Palo Arañado Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 51x49x46mm, main xl=20mm
 Description:
 Viewed:  599 Time(s)

IMG_8803nb.JPG



IMG_8836nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Palo Arañado Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 51x49x46mm, main xl=20mm
 Description:
 Viewed:  603 Time(s)

IMG_8836nb.JPG


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Fiebre Verde




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PostPosted: Jul 29, 2018 15:48    Post subject: Re: Collection of Fiebre Verde - Chivor (#686)  

Elongated crystal from Chivor with a complex termination.

Crystal has an unusual hollow cavity down through the upper quarter (5mm).
The void inside the crystal looks like a real crystal - so this is clearly a negative crystal.

The cause of this negative-crystal cavity (crystal-shaped hollow cavity) is unclear to me.
Schmetzer & al. (2011), Chemical and growth zoning in trapiche tourmaline from Zambia – a re-evaluation, JoG, Vol 32, No.5-8
suggest 2 possibilities
1) Trapping of a solid inclusion and subsequent blocking of crystal growth with the formation of a growth induced, elongated void in the direction of crystal growth (arrow) subsequent to trapping of the small mineral grain
2) Trapping of a solid inclusion, movement of the trapped small mineral grain in the direction of the arrow and of the growing crystal face and formation of a growth induced, elongated void in the wake of the moving mineral grain, a mechanism repeated in several steps

Are any of you aware of any other possible explanation?



IMG_6664nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, El Oriente Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20mm
 Description:
Photo taken in daylight conditions
 Viewed:  439 Time(s)

IMG_6664nb.JPG



IMG_8894nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, El Oriente Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20mm
 Description:
 Viewed:  436 Time(s)

IMG_8894nb.JPG



IMG_8924nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, El Oriente Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20mm
 Description:
 Viewed:  436 Time(s)

IMG_8924nb.JPG



IMG_8948nb.JPG
 Mineral: Beryl (variety emerald)
 Locality:
Chivor mining district, El Oriente Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 20mm
 Description:
 Viewed:  436 Time(s)

IMG_8948nb.JPG


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Roger Warin




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PostPosted: Jul 29, 2018 23:59    Post subject: Re: Collection of Fiebre Verde  

Hi Fiebre Verde,
You said “The cause of this crystal-shaped hollow cavity is unclear to me.”

I think it would be a fluid inclusion, a liquid with maybe even a third gaseous phase (CO2 ?), which has locally prohibited growth (in hydrothermal conditions).
Under these conditions, the crystal grows by forming faces whose indices are consistent with inverted growth.
Subsequently, fluid inclusion escaped.
A solid inclusion would give foreign faces to beryl and would have dropped impurities, I believe.
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Fiebre Verde




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PostPosted: Jul 30, 2018 07:34    Post subject: Re: Collection of Fiebre Verde  

Roger Warin wrote:
Hi Fiebre Verde,
You said “The cause of this crystal-shaped hollow cavity is unclear to me.”

I think it would be a fluid inclusion, a liquid with maybe even a third gaseous phase (CO2 ?), which has locally prohibited growth (in hydrothermal conditions).
Under these conditions, the crystal grows by forming faces whose indices are consistent with inverted growth.
Subsequently, fluid inclusion escaped.
A solid inclusion would give foreign faces to beryl and would have dropped impurities, I believe.

Hello Roger
I overlooked the geometry aspect of the cavity - faces and overall shape.
I didn't consider the possibility of a trapped fluid inclusion - even less gas inclusion - for being the root cause of the cavity.
Need to become more acquainted with the basic concepts in the physics of crystal growth and the properties of crystal surfaces!
Thanks for your insights Roger.
Gérard
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Roger Warin




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PostPosted: Jul 30, 2018 08:50    Post subject: Re: Collection of Fiebre Verde  

OK, thank you Gerard.
Roger.
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PostPosted: Jul 30, 2018 22:46    Post subject: Re: Collection of Fiebre Verde  

Hi Gérard,
Summer nights may be good for insomnia.
Why not think about minerals?
I compared the presence of a cavity in your emerald to the texture of the beryl variety heliodor of Ukraine.
These negative facets are not growth figures, but on the contrary they result from an inverse process, namely dissolution in a hydrothermal medium at the end of growth.
The kinetics of this dissolution depends on the population density of the reticular planes.
These figures are not in relief, but in negative, as in an intaglio. These are hoppers (stairs cavities).



146-Heliodore_Ukr_1_R.jpg
 Mineral: Beryl, var. Heliodor
 Locality:
Wolodarsk-Wolynskii, Zhytomyr Oblast', Ukraine
 Description:
Dissolution cavities
 Viewed:  294 Time(s)

146-Heliodore_Ukr_1_R.jpg



147-Heliodore-cavités_#1-1a_R.jpg
 Mineral: Beryl, var. Heliodor
 Description:
 Viewed:  294 Time(s)

147-Heliodore-cavités_#1-1a_R.jpg


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Fiebre Verde




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PostPosted: Jul 31, 2018 07:52    Post subject: Re: Collection of Fiebre Verde  

Roger Warin wrote:
Hi Gérard,
Summer nights may be good for insomnia.
Why not think about minerals?
I compared the presence of a cavity in your emerald to the texture of the beryl variety heliodor of Ukraine.
These negative facets are not growth figures, but on the contrary they result from an inverse process, namely dissolution in a hydrothermal medium at the end of growth.
The kinetics of this dissolution depends on the population density of the reticular planes.
These figures are not in relief, but in negative, as in an intaglio. These are hoppers (stairs cavities).

Hello Roger,

Thank you for posting this superb example of post-crystallization dissolution!

I know that the quality of the images I posted is not optimal but they all show strong linear features in the c-axis direction in relation with the cavity faces.
Am afraid I don’t have the proper equipment to take close up pictures of these features but I will give it another try.

From what I understand, it’s not always possible to positively attribute patterns and figures to dissolution kinetics or growth kinetics – even less when it’s the result of a combination of both processes. Quite a fascinating topic!

Gérard
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PostPosted: Aug 01, 2018 16:40    Post subject: Re: Collection of Fiebre Verde - Cunas (#695)  

Beryl prism solidly attached to a calcite crystal.
Dissolution patterns can be seen on all faces.



IMG_8540nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x26x18mm (calcite xl), xls=8.5 & 4mm
 Description:
The base of the beryl crystal can be seen through the calcite.
 Viewed:  200 Time(s)

IMG_8540nb.JPG



IMG_8461nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x26x18mm (calcite xl), xls=8.5 & 4mm
 Description:
 Viewed:  200 Time(s)

IMG_8461nb.JPG



IMG_8502nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x26x18mm (calcite xl), xls=8.5 & 4mm
 Description:
 Viewed:  200 Time(s)

IMG_8502nb.JPG



IMG_8472nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x26x18mm (calcite xl), xls=8.5 & 4mm
 Description:
 Viewed:  200 Time(s)

IMG_8472nb.JPG



IMG_8633nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x26x18mm (calcite xl), xls=8.5 & 4mm
 Description:
 Viewed:  202 Time(s)

IMG_8633nb.JPG



IMG_8693nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x26x18mm (calcite xl), xls=8.5 & 4mm
 Description:
 Viewed:  202 Time(s)

IMG_8693nb.JPG


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