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n. A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.

n. A mineral consisting of the hydrated calcium sulphate. When calcined, it forms plaster of Paris.

n. 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.

n. Native hydrous sulphate of calcium, a mineral usually of a white color, but also gray, yellow, red, and when impure brown or black.

n. a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)

"In the same manner as sulphur and coal belong to periods of formation very remote from each other, the sal-gem is also found sometimes in transition gypsum, * sometimes in the Alpine limestone, * sometimes in a muriatiferous clay lying on a very recent sandstone, * and lastly, sometimes in a gypsum* posterior to the chalk."

calcium sulfate    mineral    calcium sulphate   

gypsum tablet    paris gypsum   

gesso    alabaster    terra alba    selenite   

gypsum board   

marl    clays    limestone    quartz    kaolin    alum    chalk    asbestos    ironstone    feldspar