Gypsum, widespread sulfate mineral of terrific industrial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In very well-produced crystals the mineral typically has become referred to as selenite. The fibrous large assortment contains a silky lustre and is called satin spar; it is translucent and opalescent and is also valued for https://www.propanraya.com/id/produk/eco-gypsum-ee-4050