Tuesday, March 20, 2007

Purple Rock mystery solved

It's lab-grown, chromium-bearing alum K(Al,Cr)(SO4)2 . 12H2O . The very nice people on the mindat message boards helped me out.
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1 comment:

Tenney said...

Wow! That is amazing! Why did they grow that in a lab? It must be too soft to use as a gemstone.

5/15/2009 1:17 PM

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