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23 Apr-18:44:42 Re: conglomerate but what type of minerals (Dale Hallmark)
23 Apr-18:25:36 Re: conglomerate but what type of minerals (Bob Harman)
23 Apr-18:14:48 Re: biotite?? not sure what this (James W)
23 Apr-18:13:40 Re: conglomerate but what type of minerals (James W)
23 Apr-18:12:39 Re: conglomerate but what type of minerals (James W)
23 Apr-18:11:54 Conglomerate but what type of minerals (James W)
23 Apr-18:10:24 Re: biotite?? not sure what this (Pete Modreski)
23 Apr-18:02:25 Re: biotite?? not sure what this (James W)
23 Apr-17:50:49 The mizunaka collection - rhodochrosite (Am Mizunaka)
23 Apr-17:37:48 Re: biotite?? not sure what this (Matt_zukowski)
23 Apr-17:27:14 Re: biotite?? not sure what this (James W)
23 Apr-17:11:40 Biotite?? not sure what this (James W)
23 Apr-12:00:06 Re: are there diamonds, peridot and sapphire in the igneous rocks? (Jesse Fisher)
23 Apr-11:45:28 Re: help identifying this conglomerate (Pete Modreski)
23 Apr-07:51:10 Re: help identifying this conglomerate (James)
23 Apr-07:08:37 Re: help identifying this conglomerate (Joe Weisberg)
23 Apr-07:07:55 Re: help identifying this conglomerate (Joe Weisberg)
23 Apr-06:49:09 Re: baryte collection of niels brouwer (Franjungle)
23 Apr-06:44:15 Re: franjungle collection (Franjungle)
23 Apr-06:25:01 Re: help identifying this conglomerate (Alanbartlett)
23 Apr-05:09:19 Re: collection of heimo hellwig (Heimo Hellwig)
23 Apr-03:55:57 Re: help identifying this conglomerate (Bob Harman)
23 Apr-03:49:14 The mizunaka collection - okenite (Am Mizunaka)
23 Apr-02:33:51 Re: collection of heimo hellwig (Pierre Joubert)
23 Apr-02:32:05 Re: are there diamonds, peridot and sapphire in the igneous rocks? (Riccardo Modanesi)

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New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014
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alfredo
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PostPosted: Apr 20, 2015 10:29    Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014  

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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PostPosted: Apr 20, 2015 10:51    Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014  

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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