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In article <3997786E.B6B66551@yahoo.com>, Adam <bel### [at] yahoo com>
wrote:
> Wait, of course Iceland spar, that is, calcite, exhibits
> birefringence. I don't know what I was thinking with the dihydrate of
> calcium sulfate, I mean gypsum. I didn't even mean gypsum when I said
> it.
I don't think crystalline calcium carbonate is the only mineral to
exhibit this behavior, though...I just can't think of another.
> Gypsum is what causes noncarbonate hardness of water.
I didn't think calcium sulfate was soluble enough to really affect water
hardness.
> Come to think of it, how would I do double refraction anyway?
By averaging the results of calculating refraction twice, with different
iors?
--
Christopher James Huff - Personal e-mail: chr### [at] mac com
TAG(Technical Assistance Group) e-mail: chr### [at] tag povray org
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/
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