Gypsum, popular sulfate mineral of terrific commercial value, made up of hydrated calcium sulfate (CaSO4·2H2O). In properly-designed crystals the mineral usually is referred to as selenite. The fibrous substantial variety has a silky lustre and is termed satin spar; it can be translucent and opalescent and is valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050