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Jordi Fabre
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Posted: Mar 25, 2014 13:02 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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Susan Robinson wrote: | I would think the antimony crystals found at the Lake George Antimony mine, Lake George, New Brunswick, Canada, would certainly qualify? |
Absolutely Susan. Far better than any other...
I add a good example from the A. E. Seaman Mineral Museum, Michigan Technical University, Houghton, Michigan thread.
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This photo of one of these superb Antimony element from Lake George Mine is part of the wonderful series of images of the Seaman Mineral Museum published by John Jaszczak in the thread: "A. E. Seaman Mineral Museum, Michigan Technical University, Houghton, Michigan" |
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bob kerr

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Posted: Mar 25, 2014 15:04 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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how about including the brochantites from Milpillas - I don't know of a close second best occurrence. the Lindstrom trophy winner this year was one (see photo attached) - and there are more that are better.
bob.
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Jordi Fabre
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Posted: Mar 25, 2014 15:06 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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bob kerr wrote: | how about including the brochantites from Milpillas... |
I have no doubts about them. I don't know better...
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Peter Megaw
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Posted: Mar 25, 2014 16:09 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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Milpillas Rules! (I was waiting to get my latest shots from Jeff Scovil to post a decent brochantite from there)
The volborthites are very significant too...although perhaps too rare to make the "availability" cut.
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John S. White
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Posted: Mar 26, 2014 04:27 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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Don't know when the antimony was available but the brochantite appeared too late to be included in the article, which was written about a year before it was published.
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Jordi Fabre
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Posted: Mar 28, 2014 14:45 Post subject: New Standards of Excellence in the Mineral Kingdom - Perovskites from Russia |
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Is clear that the major sources of "new Standards of Excellence" in the last times have been Russia and China, two giants which came to the collector's specimens just recently.
One good example of this, not listed in the article, could be the Perovskites from Zlatoust, Chelyabinsk Oblast, Russia.
Nothing to compare was mined before, at least as far as i know.
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Perovskite on Calcite Zlatoust, Chelyabinsk Oblast, Russia Specimen size: 2.9 × 2.4 × 2.2 cm Main crystal size: 1.5 × 1.2 cm Photo: Reference Specimens |
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John S. White
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Posted: Mar 29, 2014 08:52 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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I thought the Russian perovskites appeared much too early to be included, but they certainly should be considered in any new listing.
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Jordi Fabre
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Posted: May 01, 2014 16:11 Post subject: New Standards of Excellence in the Mineral Kingdom - Zoisite (var tanzanite) |
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I believe no one will argue this! ;-)
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A great example from Michael Shaw: Zoisite var. tanzanite D Block, Merelani Mines, Lelatema Mts., Manyara Region, Tanzania 1.5 x 1.9 cm Deep blue tanazanite crystals in parallel growth. Photo: "Crosstimber" |
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Recently unusual bluish Prehnite appeared together with the tanzanites:
Zoisite var tanzanite and Prehnite Merelani Hills, Lelatema Mountains, Arusha, Tanzania Specimen size: 3.6 × 1 × 1.2 cm Main crystal size: 3.6 × 1.2 cm Mined in 2010 Photo: Reference Specimens |
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Jordi Fabre
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Posted: Apr 20, 2015 08:03 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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One more addition to the New Standards of Excellence "wonder list" : the Plumbogummites coating or replacing Pyromorphite from the Yangshuo Mine, Yangshuo County, Guilin, Guangxi Zhuang, China.
Mineral: | Plumbogummite coating Pyromorphite |
Locality: | Yangshuo / Laohu area, Haiyang Mountains, Guilin Prefecture, Guangxi Zhuang Autonomous Region, China |  |
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Dimensions: | Specimen size: 2 × 1.9 × 1.2 cm |
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Mineral: | Plumbogummite after Pyromorphite |
Locality: | Yangshuo / Laohu area, Haiyang Mountains, Guilin Prefecture, Guangxi Zhuang Autonomous Region, China |  |
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Dimensions: | Specimen size: 2.4 × 1.6 × 2 cm |
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bob kerr

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Posted: Apr 20, 2015 10:01 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - Zoisite (var tanzanite) |
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Jordi Fabre wrote: | I believe no one will argue this! ;-) |
with respect to the tanzanites - maybe - only because how can you tell if the color is natural or heat treated? I really don't think you can and EVERYONE seems to claim the color is natural until you talk with some locals who say EVER tanzanite is heat treated. highly suspicious.
bob
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alfredo
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Posted: Apr 20, 2015 10:29 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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Bob, Heat treatment of tanzanites varies with the point of view: always natural, if you're selling; heat treated, if you're buying ;))
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bob kerr

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Posted: Apr 20, 2015 10:51 Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014 |
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alfredo wrote: | Bob, Heat treatment of tanzanites varies with the point of view: always natural, if you're selling; heat treated, if you're buying ;)) |
good point!
it's just that it seems to me that these are mainly marketed for cutting/jewelry and in that market color is everything and what matter does it make where the color comes from. it spills over to the specimen trade without any real regard for the truth.
I do like them though and have a few in my display collection - usually get the immediate eye of any viewer!
bob
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