Definition of material - gypsum

What is gypsum? (stone)

Mineral composed of hydrated calcium sulfate used in construction. Gypsum is a building material white and easy to shape while wet. Once dry, the plaster becomes rigid and has therefore been used since ancient times. The hardened plaster is sensitive to water thus is normally used indoors.

Recommended sights

Cities with constructions using gypsum as one of principal materials