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gypsum
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    Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.

gypsum

Common sulphate mineral, composed of hydrous calcium sulphate, CaSO4.2H2O. It ranks 2 on the Mohs scale of hardness. Gypsum is used for making casts and moulds, and for blackboard chalk.

A fine-grained gypsum, called alabaster, is used for ornamental work. Roasted gypsum is known as plaster of Paris, because for a long time it was obtained from the gypsum quarries of the Montmartre district of Paris.



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