Gyprock vs. Gypsum

Gyprock and Gypsum Definitions
Gyprock
Rock rich in gypsum; gypsic soil.
Gypsum
A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.
Gyprock
Drywall.
Gypsum
A mineral consisting of hydrated calcium sulphate. When calcinated, it forms plaster of Paris.
Gyprock
To drywall.
Gypsum
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.
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Gypsum
A common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)