"George Patterson" wrote in message
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UltraJohn wrote:

Isn't gypsum = to limestone, water and talc ?

No. http://www.minerals.net/mineral/sulf...sum/gypsum.htm

George Patterson

Right. It occurs in veins, only in a few places in the country, and has
clumps of gypsum imbedded in other garbage rock. They crush it, and in a
liquid solution that has a specific gravity of 2.5, (as I recall), the
gypsum floats right off the top of the solution.
--
Jim in NC