Gypsum, popular sulfate mineral of terrific commercial great importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-designed crystals the mineral typically has long been referred to as selenite. The fibrous massive variety incorporates a silky lustre and is named satin spar; it's translucent and opalescent and is also valued for https://www.propanraya.com/id/produk/eco-gypsum-ee-4050