New Mineral Named After GIA’s John Koivula
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 Post subject: Black tourmaline
PostPosted: Sun Sep 23, 2012 11:16 am 
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Hi ,

I have a question , maybe someone can help me, I bought some 16 grams black tourmaline, one piece, when I shine a flash-light on it, you can see a nice purple coming thru, and can only be seen with the flash-light, I want to know if it will be heat treated will it come out neon or will it stays black. I'm new in this type. One guy told me that the color in hand is the color it will be.

I just need some advise please, if I want to sell it, can you do first heat and faceting first or visa visa ( in past experience when faceting with other stone it is never the shape they want.

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 Post subject: Re: Black tourmaline
PostPosted: Sun Sep 23, 2012 12:30 pm 
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It's not going to come out neon; shorl is not known to alter with heat, but give it a try.....what do you have to loose?


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 Post subject: Re: Black tourmaline
PostPosted: Sun Sep 23, 2012 1:48 pm 
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Thanks for the reply, so can i heat it before faceting the stone? I have to take it to someone who knows, just need to know if heat comes before faceting. Its such a lovely color with the flashlight I will be holding thumbs it comes out neon.

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Alex


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 Post subject: Re: Black tourmaline
PostPosted: Sun Sep 23, 2012 4:04 pm 
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It is my understanding that blacks and dark greens do not alter with heat.
The tourmaline appearing a "neon" color never started out being almost black.

That being said, there is a rather famous pegmatite at Virgem da Lapa, Brazil which has produced some very dark purple schorl. The specimens are chemically in the elbaite-schorl series.
Here is a pic of one taken by Rob Lavinsky:
http://www.mindat.org/photo-216398.html

Also,....I don't think I've ever seen faceted schorl....have I?


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 Post subject: Re: Black tourmaline
PostPosted: Mon Sep 24, 2012 12:15 am 
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Thank you very much, Attached is the picture.
Image
Regards
Alex


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 Post subject: Re: Black tourmaline
PostPosted: Mon Sep 24, 2012 11:14 am 
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I've attempted heat treatment of similarly colored tourmaline with no success. I sincerely doubt this one will behave any differently.

Jason

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 Post subject: Re: Black tourmaline
PostPosted: Mon Sep 24, 2012 11:17 am 
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Hi There,

Thank you very much, it helps to have people who at least know been there and done it,.

Thanks
Alex


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