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'''Calcium sulfate''', also known as '''gypsum''', is an unusually soft [[mineral]] that occurs in [[nature]]. Gypsum is number 2 on the [[Mohs Hardness Scale]].
'''Calcium sulfate''', also known as '''gypsum''', is an unusually soft [[mineral]] that occurs in [[nature]]. Gypsum is number 2 on the [[Mohs Hardness Scale]]. Gypsum is a key ingredient in [[cement]], plaster, and drywall. Crystallized gypsum is called [[Selenite]]. The [[chemical]] formula for gypsum is CaSO<sub>4</sub> · 2(H<sub>2</sub>O) <ref> http://www.white-sands-new-mexico.com/about_gypsum.htm</ref>
==References==
<references/>
[[Category:Minerals]]
[[Category:Minerals]]