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number 2 on the Mohs Hardness Scale
'''Calcium sulfate''', also known as '''gypsum''', is an unusually soft [[mineral]] that occurs in [[nature]].
'''Calcium sulfate''', also known as '''gypsum''', is an unusually soft [[mineral]] that occurs in [[nature]]. Gypsum is number 2 on the [[Mohs Hardness Scale]].
[[Category:Minerals]]
[[Category:Minerals]]