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It has a melting point of 1450 degree c. It is odourless and only slightly soluble in water. Calcium sulfate also occur in forms known as selenite, terra alba, satin spar, and light spar. Synonyms : Calcium sulphate, anhydrous gypsum, anhydrous sulphate of lime . Uses : Calcium sulphate is used as a direct additive in cement and food industry.