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Gypsum

Gypsum, common soft white mineral, a hydrate of calcium sulfate (CaSO42H2O), used to make plaster. Alabaster, a variety of gypsum, is carved to make ornamental objects. Gypsum has been used as a fertilizer because of its calcium content. Hard well and spring water often contain gypsum.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Grand Rapids to Hadron