Gypsum, widespread sulfate mineral of good industrial significance, composed of hydrated calcium sulfate (CaSO4·2H2O). In nicely-produced crystals the mineral typically has become known as selenite. The fibrous large selection has a silky lustre and is called satin spar; it really is translucent and opalescent and is particularly valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050