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Definitions for: Gypsum [n] a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
Webster (1913) Definition: Gyp"sum, n. [L. gypsum, Gr. ?; cf. Ar. jibs plaster,
mortar, Per. jabs?n lime.] (Min.)
A mineral consisting of the hydrous sulphate of lime
(calcium). When calcined, it forms plaster of Paris. Selenite
is a transparent, crystalline variety; alabaster, a fine,
white, massive variety.
See Also: alabaster, atomic number 20, Ca, calcium, mineral, plaster, plaster of Paris, terra alba
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