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Collection of Michael Shaw
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crosstimber
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PostPosted: Nov 12, 2018 12:22    Post subject: Re: Collection of Michael Shaw  




Muscovite (var. chromian) - Hiddenite, Alexander Co., North Carolina.jpg
 Mineral: Muscovite
 Locality:
Hiddenite, Alexander County, North Carolina, USA
 Dimensions: 1.9 x 2.0 cm
 Description:
A silvery pseudohexagonal muscovite crystal with side illumination showing intense green color due to small amounts of chromium.
 Viewed:  1298 Time(s)

Muscovite (var. chromian) - Hiddenite, Alexander Co., North Carolina.jpg


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Fiebre Verde




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PostPosted: Nov 12, 2018 13:26    Post subject: Re: Collection of Michael Shaw  

Nice little specimen Michael!
If am not mistaken, that variety is commonly called fuchsite.
Chrome Muscovite is pretty common in the Colombian emerald belts but I have never seen hexagonal crystals.
Gérard
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crosstimber
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PostPosted: Nov 12, 2018 15:24    Post subject: Re: Collection of Michael Shaw  

Fiebre Verde wrote:
Nice little specimen Michael!
If am not mistaken, that variety is commonly called fuchsite.
Chrome Muscovite is pretty common in the Colombian emerald belts but I have never seen hexagonal crystals.
Gérard


Thanks Gérard. Yes, fuchsite is the variety of green muscovite resulting from small amounts of chromium substituting for aluminum. Most of the fuchsite I have seen occurs as micaceous masses, but I am aware of at least two other localities that have produced good crystals - Berezovsk, Russia and Malacacheta, Brazil.
Michael
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crosstimber
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PostPosted: Nov 14, 2018 15:24    Post subject: Re: Collection of Michael Shaw  




Amethyst-smoky quartz - Moosup, CT.jpg
 Mineral: Quartz (variety amethyst/smoky quartz)
 Locality:
Quartz locality, Moosup, Windham County, Connecticut, USA
 Dimensions: 1.7 x 2.5 cm
 Description:
A doubly-terminated amethyst crystal growing on a zoned crystal of smoky and amethystine quartz
 Viewed:  1199 Time(s)

Amethyst-smoky quartz - Moosup, CT.jpg


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crosstimber
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PostPosted: Nov 16, 2018 10:14    Post subject: Re: Collection of Michael Shaw  

I first ran across these interesting Colombian fluorites at the 2016 Tucson show. At that time most of the specimens had a fair amount of damage. I saw a few more pieces this past September at the Denver show. This specimen was collected in 2017 and it is relatively damage-free. In talking with the dealer, who is very familiar with the locality, these fluorites are found in the upper levels of the mine and good specimens are somewhat scarce. Apparently none were found this year. The mid levels of the mine produce some spectacular quartz clusters, and the emeralds are found in the lower mine levels.


2571 Fluorite - Penas Blancas Mine, Colombia.jpg
 Mineral: Fluorite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Description:
Colorless frosted cubic fluorite crystals with prominent green color centers within the corners. As this is an emerald mine, I assume the green color is caused by chromium. 4.6 x 4.8 cm.
 Viewed:  1106 Time(s)

2571 Fluorite - Penas Blancas Mine, Colombia.jpg


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Fiebre Verde




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PostPosted: Nov 16, 2018 11:23    Post subject: Re: Collection of Michael Shaw  

I have seen many samples of those chromium-rich fluorites - most of them badly damaged - yours is definitely a clean specimen!
Actually beryls and fluorites do mix in Peñas Blancas - two fluorite crystals can be seen in this specimen on the right of the main emerald.
Apologies for the poor quality of the photo.
Gérard



penas-blancas_fluorite.jpg
 Mineral: Beryl (variety emerald), Quartz, Fluorite, Calcite
 Locality:
Peñas Blancas Mine, Municipio San Pablo de Borbur, Western Emerald Belt, Boyacá Department, Colombia
 Dimensions: 10cm across
 Description:
 Viewed:  1094 Time(s)

penas-blancas_fluorite.jpg


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franjungle
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PostPosted: Nov 17, 2018 01:04    Post subject: Re: Collection of Michael Shaw  

Hi Michael.

Sadly all of these fluorites I´ve seen the last week in Bogotá and also now in Medellín were very damaged. The best specimens fly quickly to USA and Europe, i think. In Madrid 2018 were at least ten nice examples of these fluorites, and also in Expominer Barcelona 2018 we could see same of these green core fluorites.

My Peñas Blancas Mine specialist dealer in Medellín didn´t have any no damage fluorite, and he offers us only really junk in this occasion, pity. And this year the Peñas Blancas Mine quartzs are stretched further than before.

Congratulations Michael. Always you are constantly in touch with the market. And your acquisition is one of the best i´ve ever seen.

From the jungle.
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crosstimber
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PostPosted: Nov 17, 2018 09:41    Post subject: Re: Collection of Michael Shaw  

Thank you for your comments Gérard and Franjungle. It's always valuable to hear about what other collectors are finding available at shows and dealers outside the U.S.
Michael
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minsur




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PostPosted: Nov 18, 2018 13:25    Post subject: Re: Collection of Michael Shaw  

Chromium is definitely a valuable option, especially in this part of the world;-)
I was told by my contacts that more probably rare earths, i.e Ytrrium, are responsible for the sometimes really bizarre zonal coloring - might result a bit difficult to really find out.
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PostPosted: Nov 18, 2018 15:01    Post subject: Re: Collection of Michael Shaw  

minsur wrote:
Chromium is definitely a valuable option, specially in this part of the world;-)
I was told by my contacts that more probably rare earths, i.e Ytrrium, are responsible for the sometimes really bizarre zonal coloring - might result a bit difficult to really find out.

Ytrrium is an option.
Various publications also suggest that divalent Samarium (Sm2+) ions can also contribute to the green coloration of the fluorite.
Divalent rare-earth ions at large, contribute to the coloration of hydrothermal fluorite.
As mentioned in Mindat (https://www.mindat.org/min-9889.html) Chrome-Fluorite is a misleading term for this Colombian hydrothermal fluorite.
Gérard
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crosstimber
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PostPosted: Nov 18, 2018 15:33    Post subject: Re: Collection of Michael Shaw  

Interesting information to consider. As Minsur suggested, it may be difficult to determine exactly what is responsible for the green zones.


Brucite - Killa Saifullah District, Pakistan.jpg
 Mineral: Brucite
 Locality:
Killa Saifullah District, Balochistan (Baluchistan), Pakistan
 Dimensions: 1.8 x 2.6 cm
 Description:
 Viewed:  862 Time(s)

Brucite - Killa Saifullah District, Pakistan.jpg


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PostPosted: Nov 21, 2018 08:19    Post subject: Re: Collection of Michael Shaw  




2586 Aragonite - Salsigne Mine, France.jpg
 Mineral: Aragonite
 Locality:
Salsigne Mine, Salsigne, Mas-Cabardès, Carcassonne, Aude, Occitanie, France
 Dimensions: 6.7 x 8.6 cm
 Description:
Snow white aragonite helictites collected in the 1980s.
 Viewed:  758 Time(s)

2586 Aragonite - Salsigne Mine, France.jpg


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PostPosted: Nov 24, 2018 11:05    Post subject: Re: Collection of Michael Shaw  




2572 Marcasite - Linwood Mine, Buffalo, Scott County, Iowa.jpg
 Mineral: Marcasite, calcite
 Locality:
Linwood Mine, Buffalo, Scott County, Iowa, USA
 Dimensions: 5.1 x 7.2 cm
 Description:
Metallic, brass-yellow spear-shaped marcasite crystals to 2.1 cm on a matrix of colorless calcite crystals.
 Viewed:  679 Time(s)

2572 Marcasite - Linwood Mine, Buffalo, Scott County, Iowa.jpg



2572 Marcasite2 - Linwood Mine, Buffalo, Scott County, Iowa.jpg
 Mineral: Marcasite, calcite
 Locality:
Linwood Mine, Buffalo, Scott County, Iowa, USA
 Dimensions: 5.1 x 7.2 cm
 Description:
 Viewed:  678 Time(s)

2572 Marcasite2 - Linwood Mine, Buffalo, Scott County, Iowa.jpg


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PostPosted: Nov 25, 2018 11:09    Post subject: Re: Collection of Michael Shaw  

A couple of older pieces that I photographed this morning.


0236 Fluorite - Moscona Mine, Solis, Asturias, Spain.jpg
 Mineral: Fluorite
 Locality:
Moscona Mine, El Llano, Solís, Corvera de Asturias, Comarca Avilés, Asturias, Principality of Asturias, Spain
 Dimensions: 5.1 x 7.3
 Description:
 Viewed:  625 Time(s)

0236 Fluorite - Moscona Mine, Solis, Asturias, Spain.jpg



0415 Descloizite - Berg Aukas, Namibia.jpg
 Mineral: Descloizite
 Locality:
Berg Aukas, Grootfontein District, Otjozondjupa Region, Namibia
 Dimensions: 5.7 x 7.8 cm
 Description:
 Viewed:  625 Time(s)

0415 Descloizite - Berg Aukas, Namibia.jpg


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PostPosted: Nov 28, 2018 09:33    Post subject: Re: Collection of Michael Shaw  




2569 Barite - Basin, Jefferson County, Montana.jpg
 Mineral: Barite
 Locality:
Indian Head Rock, Basin, Condado Jefferson, Jefferson County, Montana, USA
 Dimensions: 6.9 x 8.7 cm
 Description:
Blocky amber-colored barite crystals to 1.5 cm with a preferential secondary overgrowth.of creamy white barite.
 Viewed:  513 Time(s)

2569 Barite - Basin, Jefferson County, Montana.jpg


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PostPosted: Nov 30, 2018 09:25    Post subject: Re: Collection of Michael Shaw  




TN725 Fluorite - Caaschwitz, Thuringia, Germany.jpg
 Mineral: Fluorite
 Locality:
Caaschwitz, Bad Köstritz, Greiz, Thuringia/Thüringen, Germany
 Dimensions: 2.7 x 2.9 cm
 Description:
 Viewed:  447 Time(s)

TN725 Fluorite - Caaschwitz, Thuringia, Germany.jpg


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Tobi




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PostPosted: Dec 02, 2018 13:55    Post subject: Re: Collection of Michael Shaw  

Beautiful Caaschwitz fluorite, Michael!
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PostPosted: Dec 02, 2018 15:11    Post subject: Re: Collection of Michael Shaw  

Tobi wrote:
Beautiful Caaschwitz fluorite, Michael!


Thanks Tobi.
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PostPosted: Dec 05, 2018 10:36    Post subject: Re: Collection of Michael Shaw  




TN716 Arsenopyrite - Dal'Negorsk, Primorskiy Kray, Russia.jpg
 Mineral: Arsenopyrite
 Locality:
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region, Russia
 Dimensions: 2.2 x 2.1 cm
 Description:
 Viewed:  260 Time(s)

TN716 Arsenopyrite - Dal'Negorsk, Primorskiy Kray, Russia.jpg


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PostPosted: Dec 07, 2018 10:10    Post subject: Re: Collection of Michael Shaw  




2580 Barite - Shirley Basin, Carbon Co., Wyoming.jpg
 Mineral: Barite
 Locality:
Shirley Basin, Medicine Bow, Shirley Basin District, Carbon County, Wyoming, USA
 Dimensions: 3.0 x 3.8 cm
 Description:
An intergrown group of bladed blue barite crystals to 2.9 cm. from a seldom seen location.
 Viewed:  201 Time(s)

2580 Barite - Shirley Basin, Carbon Co., Wyoming.jpg


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