anhydrite

noun

1. a mineral, anhydrous calcium sulfate, CaSO4, usually occurring in whitish or slightly colored masses.

noun

1. a colourless or greyish-white mineral, found in sedimentary rocks. It is used in the manufacture of cement, fertilizers, and chemicals. Composition: anhydrous calcium sulphate. Formula: CaSO 4 . Crystal structure: orthorhombic