Gypsum, prevalent sulfate mineral of terrific industrial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In very well-created crystals the mineral frequently is called selenite. The fibrous enormous wide range contains a silky lustre and is called satin spar; it's translucent and opalescent which is valued for ornaments and jewellery. Gypsum https://www.propanraya.com/id/produk/eco-gypsum-ee-4050