Novembr 16-18—COLUMBIA, SOUTH CAROLINA: Annual show; The Columbia, SC Gem and Mineral Society; Fri. 10-6, Sat. 10-6, Sun. 12-5
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 Post subject: Win a FREE Download of GT Pro!
PostPosted: Thu May 10, 2018 10:32 am 
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Haven't done this in ages. The first person to ID this gemstone will win a free download of Gemology Tools Professional.
Clues:
1) Transparent
2) Colorless
3) High RI: 1.65
4) Low RI: 1.49
5) SG: 2.20

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 Post subject: Re: Win a FREE Download of GT Pro!
PostPosted: Thu May 10, 2018 11:55 am 
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Whewellite?


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 Post subject: Re: Win a FREE Download of GT Pro!
PostPosted: Thu May 10, 2018 12:05 pm 
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Well, that didn't take long! Must have been too easy.

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 Post subject: Re: Win a FREE Download of GT Pro!
PostPosted: Thu May 10, 2018 12:07 pm 
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Whewellite is correct! 1bwana1 wins a GT Pro download!

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Bill Wise
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 Post subject: Re: Win a FREE Download of GT Pro!
PostPosted: Thu May 10, 2018 12:48 pm 
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The most consistent property in gemmology is birefringence. This one was unique, and led me straight to the answer. Very obscure stone to be sure, but I have personally passed one in the past. LOL. :?

Thanks for your support of the industry and the forum. Know that it is appreciated.

Steve


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 Post subject: Re: Win a FREE Download of GT Pro!
PostPosted: Thu May 10, 2018 2:46 pm 
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Steve that is a brilliant and accurate fact!
Birefringence is as important as refractive index!

Just as a sidebar, I use Gemology Tools Pro everyday,
If you don't have a copy, get one!


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