Gypsum, common sulfate mineral of good commercial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In properly-developed crystals the mineral commonly has actually been called selenite. The fibrous significant variety has a silky lustre and is termed satin spar; it is actually translucent and opalescent and is also valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050