Post subject: Birefringence question from Journal of Gemmology Vol.30 7/8
Posted: Sun Jan 30, 2011 5:42 am
Established Member
Joined: Sat Jun 05, 2010 9:47 am Posts: 16
Hi, can anyone help me with this question?
From The Journal of Gemmology, Volume 30 No. 7/8, July/October 2007. Page 447, there are three graphs, for Gemstone A, Gemstone B and Gemstone C. From these graphs, what is the birefringence of each stone and how is it worked out?
Post subject: Re: Birefringence question from Journal of Gemmology Vol.30
Posted: Sun Jan 30, 2011 1:34 pm
Established Member
Joined: Sat Jun 05, 2010 9:47 am Posts: 16
Hi,
Sorry, no scanner. Is the birefringence always the diffence between alpha and gamma RI's? Also, if asked for birefrigence should we include a pos or neg sign if able to determine the optic nature?
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