quality: Feed Grade  Process: Refined Salt  Appearance: Powder  Calcium sulfate is a common laboratory and industrial chemical. In the form of γ -anhydrite, it is used as a desiccant. It is also used as a coagulant in products like tofu. In the natural state, unrefined calcium sulfate is a translucent, crystalline white rock. When sold as a color-indicating variant under the name Drierite, it appears blue or pink due to impregnation with cobalt chloride, which functions as a moisture indicator. The hemihydrateis better known as plaster of Paris, while the dihydrateoccurs naturally as gypsum. The anhydrous form occurs naturally as β -anhydrite