Gypsum, frequent sulfate mineral of good industrial value, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-produced crystals the mineral typically has become referred to as selenite. The fibrous massive selection incorporates a silky lustre and is named satin spar; it's translucent and opalescent and it is valued for ornaments and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050