gypsum definition

  • noun:
    • A widespread colorless, white, or yellow mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster items, and fertilizers.
    • A mineral comprising the hydrated calcium sulphate. When calcined, it forms plaster of Paris.
    • A mineral comprising the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a superb, white, huge variety.
    • local hydrous sulphate of calcium, a mineral often of a white color, but additionally gray, yellow, red, and when impure brown or black colored.
    • a typical white or colorless mineral (hydrated calcium sulphate) familiar with make cements and plasters (especially plaster of Paris)

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