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> > BTW, I don't think gypsum is double refracting, I think you mean calcite.

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. Gypsum is what causes noncarbonate
hardness of water.

Come to think of it, how would I do double refraction anyway?

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