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25 May-18:39:19 The mizunaka collection - quartz (Am Mizunaka)
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25 May-12:24:51 Re: hematite twins (article in rocks & minerals jan/feb 2018) (Pete Richards)
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24 May-03:12:51 The mizunaka collection - rhodochrosite (Am Mizunaka)
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Collection of Fiebre Verde
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Fiebre Verde




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PostPosted: Apr 14, 2016 12:31    Post subject: Re: Collection of Fiebre Verde - Cunas (#456)  

Cunas at its best.
Some of the dolomite rhombs have a nice opalescence.



IMG_0119nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35x21x16mm, main xl=11x8mm
 Description:
 Viewed:  9193 Time(s)

IMG_0119nb.JPG



IMG_0133nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite
 Dimensions: 35x21x16mm, main xl=11x8mm
 Description:
Note the opalescent dolomite.
 Viewed:  9228 Time(s)

IMG_0133nb.JPG



IMG_0141nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35x21x16mm, main xl=11x8mm
 Description:
 Viewed:  9170 Time(s)

IMG_0141nb.JPG



IMG_0162nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35x21x16mm, main xl=11x8mm
 Description:
 Viewed:  9193 Time(s)

IMG_0162nb.JPG



IMG_0177nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite
 Locality:
La Pita mining district, Cunas Mine, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 35x21x16mm, main xl=11x8mm
 Description:
More opalescence...
 Viewed:  9182 Time(s)

IMG_0177nb.JPG


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Fiebre Verde




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PostPosted: Apr 16, 2016 10:08    Post subject: Re: Collection of Fiebre Verde - Gachalá (#457)  

2 generations of calcite in this Gachalá specimen.
Clear beryl crystals.



IMG_0206nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9090 Time(s)

IMG_0206nb.JPG



IMG_0332nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9101 Time(s)

IMG_0332nb.JPG



IMG_0216nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9091 Time(s)

IMG_0216nb.JPG



IMG_0261nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9110 Time(s)

IMG_0261nb.JPG



IMG_0303nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9090 Time(s)

IMG_0303nb.JPG



IMG_0247nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9086 Time(s)

IMG_0247nb.JPG



IMG_0241nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
 Viewed:  9108 Time(s)

IMG_0241nb.JPG



IMG_0316nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 39x27x25mm, main xl=11mm
 Description:
Rainbow iridescence.
 Viewed:  9121 Time(s)

IMG_0316nb.JPG


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Fiebre Verde




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PostPosted: Apr 18, 2016 14:10    Post subject: Re: Collection of Fiebre Verde - Chivor (#422)  

The lighter crystal is heavily corroded but is water clear in comparison to the darker one standing next to it (also with etched faces).
Specimen has some remnants of the black shale host rock.



IMG_0366nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x24x29mm, largest xl=17mm
 Description:
 Viewed:  9039 Time(s)

IMG_0366nb.JPG



IMG_0383nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x24x29mm, largest xl=17mm
 Description:
 Viewed:  9041 Time(s)

IMG_0383nb.JPG



IMG_0445nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x24x29mm, largest xl=17mm
 Description:
 Viewed:  9052 Time(s)

IMG_0445nb.JPG



IMG_0469nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x24x29mm, largest xl=17mm
 Description:
 Viewed:  9047 Time(s)

IMG_0469nb.JPG



IMG_0494nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x24x29mm, largest xl=17mm
 Description:
 Viewed:  9043 Time(s)

IMG_0494nb.JPG


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Fiebre Verde




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PostPosted: Apr 20, 2016 13:08    Post subject: Re: Collection of Fiebre Verde - Coscuez (#390)  

Emerald crystals are formed in geological environments characterized by considerable mechanical stress. This specimen is a good illustration of these extreme conditions.
Matrix has clearly a brecciated aspect with the calcite acting as a cement.
On the other hand, the spectacular glowing effect of the emerald is due to the presence of numerous internal cracks and fissures which are reflecting light.
Host rock is black shale.



IMG_0650nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70x65x43mm, xl=12mm
 Description:
 Viewed:  8978 Time(s)

IMG_0650nb.JPG



IMG_0854nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70x65x43mm, xl=12mm
 Description:
 Viewed:  8982 Time(s)

IMG_0854nb.JPG



IMG_0829nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70x65x43mm, xl=12mm
 Description:
 Viewed:  8984 Time(s)

IMG_0829nb.JPG



IMG_0801nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70x65x43mm, xl=12mm
 Description:
 Viewed:  8979 Time(s)

IMG_0801nb.JPG



IMG_0814nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Coscuez mining district, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 70x65x43mm, xl=12mm
 Description:
 Viewed:  8991 Time(s)

IMG_0814nb.JPG


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Fiebre Verde




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PostPosted: Apr 21, 2016 16:24    Post subject: Re: Collection of Fiebre Verde - La Pita (#325)  

Another beryl specimen from Colombia - please bear with me.
I will find something else for my next post. Not necessarily better, but certainly different.

Host rock is black shale.



IMG_0924nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x63x65mm, xl=10mm
 Description:
 Viewed:  8886 Time(s)

IMG_0924nb.JPG



IMG_0949nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x63x65mm, xl=10mm
 Description:
 Viewed:  8874 Time(s)

IMG_0949nb.JPG



IMG_0930nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x63x65mm, xl=10mm
 Description:
 Viewed:  8873 Time(s)

IMG_0930nb.JPG



IMG_0965nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x63x65mm, xl=10mm
 Description:
 Viewed:  8875 Time(s)

IMG_0965nb.JPG



IMG_0981nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 38x63x65mm, xl=10mm
 Description:
 Viewed:  8894 Time(s)

IMG_0981nb.JPG


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Fiebre Verde




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PostPosted: Apr 22, 2016 12:40    Post subject: Re: Collection of Fiebre Verde - NOT from Colombia (#8200)  

It's not beryl, it's not green and it comes from the largest alkaline complex in the world, the Khibiny massif in Russia's Kola peninsula.

Association of Rastsvetaevite, Fenaksite, Delhayelite, Lamprophyllite, and Aegirine. Not sure if everybody is familiar with those minerals but I personally find e-m-e-r-a-l-d much easier to spell :-)



IMG_0989nb.JPG
 Mineral: Rastsvetaevite, Fenaksite, Delhayelite, Lamprophyllite. Aegirine
 Locality:
Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
 Dimensions: 72x47x47mm
 Description:
Carmine-red Rastsvetaevite, more often called Eudialyte which is actually the name of the group this mineral belongs to.
 Viewed:  8837 Time(s)

IMG_0989nb.JPG



IMG_1012nb.JPG
 Mineral: Rastsvetaevite, Fenaksite, Delhayelite, Lamprophyllite. Aegirine
 Locality:
Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
 Dimensions: 72x47x47mm
 Description:
The intergrown brown elongated crystals is Lamprophyllite. The white rectangular patch on its right side is Delhayelite.
 Viewed:  8817 Time(s)

IMG_1012nb.JPG



IMG_1052nb.JPG
 Mineral: Rastsvetaevite, Fenaksite, Delhayelite, Lamprophyllite. Aegirine
 Locality:
Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
 Dimensions: 72x47x47mm
 Description:
Rastsvetaevite (right), Fenaksite (light grey and brown patch on the left) and Aegirine (black striated, right under the Rastsvetaevite).
 Viewed:  8839 Time(s)

IMG_1052nb.JPG



IMG_1076nb.JPG
 Mineral: Rastsvetaevite, Fenaksite, Delhayelite, Lamprophyllite. Aegirine
 Locality:
Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
 Dimensions: 72x47x47mm
 Description:
Lamprophyllite (brown) and Delhayelite (white cleaved crystals)
 Viewed:  8836 Time(s)

IMG_1076nb.JPG



IMG_1066nb.JPG
 Mineral: Rastsvetaevite, Fenaksite, Delhayelite, Lamprophyllite. Aegirine
 Locality:
Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
 Dimensions: 72x47x47mm
 Description:
Fenaksite and Rastsvetaevite.
 Viewed:  8840 Time(s)

IMG_1066nb.JPG


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PostPosted: Apr 23, 2016 16:50    Post subject: Re: Collection of Fiebre Verde - Euclase in matrix (#6103)  

From red to blue.
Euclase is an uncommon mineral but euclase in matrix from Gachalá is a rarity.
Euclase only comes from two localities in Colombia: La Marina in the Western Belt and Gachalá in the Eastern Belt.
In La Marina, euclase is typically associated with albite (and more rarely fluorapatite); In Gachalá, it's often associated with calcite and sometimes pyrite.
Crystals of this specimen display a pretty strong pleochroism from light greyish-blue to shades of deep blue.
Note the iridescence in some images.



IMG_1139nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8745 Time(s)

IMG_1139nb.JPG



IMG_1113nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8764 Time(s)

IMG_1113nb.JPG



IMG_1151nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8753 Time(s)

IMG_1151nb.JPG



IMG_1163nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8757 Time(s)

IMG_1163nb.JPG



IMG_1293nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8769 Time(s)

IMG_1293nb.JPG



IMG_1201nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8754 Time(s)

IMG_1201nb.JPG



IMG_1213nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8749 Time(s)

IMG_1213nb.JPG



IMG_1230nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8761 Time(s)

IMG_1230nb.JPG



IMG_1256nb.JPG
 Mineral: Euclase, Calcite, Pyrite
 Locality:
Gachalá mining district, Municipio Gachalá, Eastern Emerald Belt, Cundinamarca, Colombia
 Dimensions: 44x26x34mm, up to 7mm
 Description:
 Viewed:  8759 Time(s)

IMG_1256nb.JPG


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PostPosted: Apr 25, 2016 15:28    Post subject: Re: Collection of Fiebre Verde - Muzo (#230)  

A good example of the typical honey-yellow dolomite rhombs that occurs in Muzo.
Muzo dolomite often exhibits opalescence.
Host rock is black shale.



IMG_1373nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 54x53x31mm, xl=5mm
 Description:
 Viewed:  8690 Time(s)

IMG_1373nb.JPG



IMG_1315nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 54x53x31mm, xl=5mm
 Description:
 Viewed:  8681 Time(s)

IMG_1315nb.JPG



IMG_1325nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 54x53x31mm, xl=5mm
 Description:
 Viewed:  8680 Time(s)

IMG_1325nb.JPG



IMG_1329nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 54x53x31mm, xl=5mm
 Description:
 Viewed:  8691 Time(s)

IMG_1329nb.JPG


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PostPosted: Apr 26, 2016 15:17    Post subject: Re: Collection of Fiebre Verde - Chivor (#334)  

These pencil-like pinacoidal terminations are typical from the El Acuario mine.
Crystals from that locality are a light green shade and virtually water-clear.
Host rock is grey shale.



IMG_1390nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x41x21mm, xl=8mm
 Description:
 Viewed:  8638 Time(s)

IMG_1390nb.JPG



IMG_1416nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x41x21mm, xl=8mm
 Description:
 Viewed:  8636 Time(s)

IMG_1416nb.JPG



IMG_1429nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x41x21mm, xl=8mm
 Description:
 Viewed:  8630 Time(s)

IMG_1429nb.JPG



IMG_1451nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 33x41x21mm, xl=8mm
 Description:
 Viewed:  8651 Time(s)

IMG_1451nb.JPG


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Fiebre Verde




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PostPosted: Apr 27, 2016 16:33    Post subject: Re: Collection of Fiebre Verde - Chivor (#321)  

A deep green crystal from Chivor with opalescent dolomite.
Host rock is grey shale.



IMG_1469nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x39x20mm, xl=10mm
 Description:
 Viewed:  8556 Time(s)

IMG_1469nb.JPG



IMG_1485nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x39x20mm, xl=10mm
 Description:
 Viewed:  8557 Time(s)

IMG_1485nb.JPG



IMG_1497nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x39x20mm, xl=10mm
 Description:
 Viewed:  8568 Time(s)

IMG_1497nb.JPG



IMG_1516nb.JPG
 Mineral: Beryl (variety emerald), Calcite, Dolomite, Pyrite
 Locality:
Chivor mining district, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x39x20mm, xl=10mm
 Description:
 Viewed:  8561 Time(s)

IMG_1516nb.JPG


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Fiebre Verde




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PostPosted: Apr 29, 2016 08:01    Post subject: Re: Collection of Fiebre Verde - La Pita (#329)  

V and Cr which are the predominant chromophoric elements in Colombian beryls, are both extracted from the black shales by the circulating basinal fluids.
There have been a few studies comparing their respective contents and ratio in various localities but results are far from being satisfactory because of the scarcity of reliable samples. And just to make things even more difficult, the variation of vanadium and chromium contents can be pretty wide within the same beryl crystal!
However a few trends can be drawn. Emeralds from La Pita seem to have the highest V/Cr ratio of all the Colombian districts. This could explain the origin of the so-called “famous grass-green shade” which is used as a trademark slogan for the material extracted from La Pita. Grass-green is actually not the most common shade in La Pita but that’s a different story.

Although this specimen is indeed from La Pita, it’s far from showing any of the common shades of green found in that district.
It’s very pale green, even paler than the material from La Pava, west of Muzo.
Although the beryl crystals lack color, I find the contrast with the striated iridescent calcite quite striking.
Host rock is black shale.



IMG_1527nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 49x44x36mm, xls=6 & 4mm
 Description:
 Viewed:  8471 Time(s)

IMG_1527nb.JPG



IMG_1544nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 49x44x36mm, xls=6 & 4mm
 Description:
 Viewed:  8475 Time(s)

IMG_1544nb.JPG



IMG_1555nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 49x44x36mm, xls=6 & 4mm
 Description:
 Viewed:  8473 Time(s)

IMG_1555nb.JPG



IMG_1605nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 49x44x36mm, xls=6 & 4mm
 Description:
 Viewed:  8474 Time(s)

IMG_1605nb.JPG



IMG_1596nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 49x44x36mm, xls=6 & 4mm
 Description:
 Viewed:  8468 Time(s)

IMG_1596nb.JPG



IMG_1624nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
La Pita mining district, Municipio Maripí, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 49x44x36mm, xls=6 & 4mm
 Description:
 Viewed:  8473 Time(s)

IMG_1624nb.JPG


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Fiebre Verde




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PostPosted: May 01, 2016 13:41    Post subject: Re: Collection of Fiebre Verde - Pyrite (#8500)  

Aggregate of bright cubic pyrite crystals with well defined growth striations.


IMG_1663nb.JPG
 Mineral: Pyrite
 Locality:
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru
 Dimensions: 62x45x42mm
 Description:
 Viewed:  8397 Time(s)

IMG_1663nb.JPG


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Fiebre Verde




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PostPosted: May 02, 2016 16:51    Post subject: Re: Collection of Fiebre Verde - Muzo (#585)  

Beryl crystals on pure white calcite is a good hint of Muzo.


IMG_1697nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 72x37x48, xl=5mm
 Description:
 Viewed:  8308 Time(s)

IMG_1697nb.JPG



IMG_1721nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 72x37x48, xl=5mm
 Description:
 Viewed:  8305 Time(s)

IMG_1721nb.JPG



IMG_1735nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 72x37x48, xl=5mm
 Description:
 Viewed:  8316 Time(s)

IMG_1735nb.JPG



IMG_1767nb.JPG
 Mineral: Beryl (variety emerald), Calcite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 72x37x48, xl=5mm
 Description:
 Viewed:  8324 Time(s)

IMG_1767nb.JPG


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Philippe Durand




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PostPosted: May 12, 2016 14:28    Post subject: Re: Collection of Fiebre Verde  

that is an amazing collection.
i didn t know, that it could exist.
Congratulation for this exceptionnal construction;
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PostPosted: May 13, 2016 07:05    Post subject: Re: Collection of Fiebre Verde  

Grand merci Philippe!
Welcome to this Forum - you will be in very good company.
Gérard
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PostPosted: May 17, 2016 09:30    Post subject: Re: Collection of Fiebre Verde - Black shale nodule with a coating of pyrite (#8501)  

Black shale nodule with a crystalline coating of pyrite.
From a recent production in Muzo.



IMG_1856nb.JPG
 Mineral: Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 48x62x31mm
 Description:
 Viewed:  7928 Time(s)

IMG_1856nb.JPG



IMG_1868nb.JPG
 Mineral: Pyrite
 Locality:
Muzo mining district, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 48x62x31mm
 Description:
 Viewed:  7929 Time(s)

IMG_1868nb.JPG


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PostPosted: May 18, 2016 14:18    Post subject: Re: Collection of Fiebre Verde - Chivor (#586)  

Another Chivor crystal with a pencil-like termination - from a recent find.
These images do not do justice to this small crystal which literally glows even in poor lighting condition.

Grey dolomite rhombs, partly oxidized pyrite nodules, snowy white coarse-grained aggregate of albite. Host rock is black shale.



IMG_1888nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x56x36mm, xl=5mm
 Description:
 Viewed:  7858 Time(s)

IMG_1888nb.JPG



IMG_1948nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x56x36mm, xl=5mm
 Description:
 Viewed:  7859 Time(s)

IMG_1948nb.JPG



IMG_1930nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x56x36mm, xl=5mm
 Description:
 Viewed:  7853 Time(s)

IMG_1930nb.JPG



IMG_1971nb.JPG
 Mineral: Beryl (variety emerald), Albite (variety cleavelandite), Dolomite, Pyrite
 Locality:
Chivor mining district, El Acuario Mine, Municipio Chivor, Eastern Emerald Belt, Boyacá Department, Colombia
 Dimensions: 50x56x36mm, xl=5mm
 Description:
This green-eyed bear is an unknown species in Colombia.
 Viewed:  7857 Time(s)

IMG_1971nb.JPG


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Philippe Durand




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PostPosted: May 18, 2016 23:53    Post subject: Re: Collection of Fiebre Verde  

Again a very nice crystal

trimed it will do a perfect thumbnail
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PostPosted: May 19, 2016 07:51    Post subject: Re: Collection of Fiebre Verde  

Philippe Durand wrote:
Again a very nice crystal

trimed it will do a perfect thumbnail


Thanks Philippe!

I am always a bit reluctant to have my specimens trimmed.
It's all about the dichotomy of aesthetics versus science.
I see some advantages in preserving specimens with crystallized matrix e.g. wider coverage of associated minerals, better sense of the emerald occurrence at a small-scale level, better understanding of their distribution and density.

Trimming in the sense of releasing the crystals from the matrix is a different story.
Fortunately (or maybe unfortunately?) I don't own lot of specimens that fall in that category :-)

Gérard
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PostPosted: May 19, 2016 17:14    Post subject: Re: Collection of Fiebre Verde - Pauna (#8600)  

I have a couple of specimens from a special ”mine” which was discovered during highway construction between Pauna and San Pablo de Borbur, back in October 2012.

A construction crew working on a steep mountain highway ran right into a huge vein of emeralds. Useless to say that when the discovery was made, the highway department stopped the construction.
The rumor of the existence of a new emerald producing open-pit mine spread very quickly and within 2 days, hundreds of persons flocked that area looking desperately for emeralds.
The story said that the three road workers who made the discovery got the first bite and sold their plunder at a good profit.
As for the name of this special mine, people still call it ”la Mina de la Carretera” - Highway Mine.
Considering the important number of specimens uncovered at that time, this find probably deserves a new entry in the locality list.
It’s located about 8km northeast from La Pita and 13km east of Coscuez which makes the Highway Mine difficult to attach to any existing emerald districts.
I suggest to have the following reference added in the locality database :
Mina de la Carretera (Highway Mine), Municipio Pauna, Western Emerald Belt, Boyacá

I drove through that section in October 2015 and there was no sign of any mining activity (and no, the road was not paved with emeralds).

All the samples I have from this locality except one contain green beryl which is easily identifiable.
When looking parallel to the bulk growth direction, honeycomb structure is what comes to mind.
When looking perpendicular to the growth direction, the mineral displays clearly a columnar habit.
Could that possibly be fuchsite - a chromian muscovite? In Sinkankas’ bible “Emerald and other Beryls”, fuchsite is mentioned as an associated mineral variety in the Muzo mineralogy section.
I am not familiar at all with this mineral variety. 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…

Gérard

PS : Don’t expect too much from these exotic mining techniques unless you live in Boyaca, Colombia.

The video is in Spanish but it is easy to figure it out.



IMG_1984nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7734 Time(s)

IMG_1984nb.JPG



IMG_1988nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7712 Time(s)

IMG_1988nb.JPG



IMG_1991nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7728 Time(s)

IMG_1991nb.JPG



IMG_1999nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7712 Time(s)

IMG_1999nb.JPG



IMG_2002nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7727 Time(s)

IMG_2002nb.JPG



IMG_2011nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7713 Time(s)

IMG_2011nb.JPG



IMG_2019nb.JPG
 Mineral: Muscovite (variety fuchsite), Pyrite
 Locality:
Highway Pauna-San Pablo de Borbur road works ("Highway Mine"), Municipio Pauna, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 55x32x11mm
 Description:
 Viewed:  7711 Time(s)

IMG_2019nb.JPG


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