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<h1>Gypsum defined as hydrous calcium sulphate mineral used for plaster and soil treatment</h1> Webster's Dictionary defines gypsum as hydrous calcium sulphate (CaSO4.2H2O), a colorless mineral occurring in monoclinic crystals that easily split into layers. The Oxford English Dictionary provides a similar definition, describing it as the mineral source for plaster of Paris. Chambers Dictionary characterizes it as a soft mineral used for plaster production. When used as a verb, gypsum refers to treating land or crops with the mineral. The substance is widely distributed globally and serves multiple purposes including soil amendment, cement retardation, and plaster manufacturing.