Difference between revisions of "Gypsum"
From London's Ghost Acres
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Revision as of 09:29, 28 April 2016
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Description
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer, and as the main constituent in many forms of plaster, blackboard chalk and wallboard.