Calcium Sulfate

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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. Gypsum is a key ingredient in cement, plaster, and drywall. Crystallized gypsum is called selenite. The chemical formula for gypsum is CaSO4 · 2(H2O) [1]