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

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

noun. 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.

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

noun. 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."

gypsum tablet  paris gypsum  

gypsum board  

calcium sulfate  calcium sulphate  mineral  

alabaster  gesso  selenite  terra alba  

alum  alumina  asbestos  carbonate  chalk