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gypsum

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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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After long hesitation and uncertainty they paid twenty-five cents for a big package of insect powder--a patent preparation which chanced to be ninety-five per cent gypsum, a harmless earth which had cost about two cents to prepare.
The Jungle by Sinclair, Upton View in context
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