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 Post subject: Re: Smitrine!
PostPosted: Sat Nov 16, 2019 4:01 pm 
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Hi Sandi. Lovely stones by the way.
Stephen what do you think? Mineralogically speaking? Chemically speaking?

PS. Everything on this forum was new to all of us at one time or another. :D


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 Post subject: Re: Smitrine!
PostPosted: Sat Nov 16, 2019 4:17 pm 
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Something about varying levels of lithium and aluminum, I think. Aluminum helps it acquire and hold a strong smoky color, lithium for the yellow, both for bronze.

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 Post subject: Re: Smitrine!
PostPosted: Mon Nov 18, 2019 11:47 am 
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Thank you Barbra and Stephen i am not familiar with all the substances responsible for coloration of stones, wanna educate me?? I m aware of the Manganese and Copper in Tourmalines and what effect they can have on color etc, but the ones you mentioned, i do not know about. If i sent one to GIA would they be able to determine what is in the stones, like what u said LOL
Sandi


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 Post subject: Re: Smitrine!
PostPosted: Mon Nov 18, 2019 1:13 pm 
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The GIA would not usually list chromophores on an identification report.
Sidebar: Trace amounts of Cu and Mn in tourmaline do not guarantee a vibrant, valuable stone. It depends on the other elements in the caldron. Since the adjective "Paraiba" can result in ridiculously inflated value, sellers look for labs listing Cu and Mn and throwing around "paraiba-type".

Causes of color in Gems:
An Update on Color in Gems. Part 1: Introduction and Colors Caused by Dispersed Metal Ions

An Update on Color in Gems. Part 2: Colors Involving Multiple Atoms and Color Centers

An Update on Color in Gems. Part 3: Colors Caused by Band Gaps and Physical Phenomena


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 Post subject: Re: Smitrine!
PostPosted: Mon Nov 18, 2019 4:35 pm 
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thanks Barbra, will need to go back on GIA and read some of their educational materials, fascinating..
Sandi


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