Gypsum
English Meaning
A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, stype forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
- A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.