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solomon levi
03-24-2010, 07:38 PM
Gypsum is hydrated calcium sulfate.

http://www.galleries.com/Minerals/Sulfates/gypsum/gypsum.htm

You can see from the massive cave crystals in Naica Mexico that it gows in
the earth. I think the etymology is interesting as well - Egypt:Gypsum

I thought this of interest as well:
http://www.polysep.ucla.edu/research%20advances/Scale_Project.htm

Another name for these sulfates is "selenites". (Selene - the moon)