Gypsum, prevalent sulfate mineral of excellent commercial great importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In nicely-developed crystals the mineral commonly has been identified as selenite. The fibrous enormous wide range provides a silky lustre and is called satin spar; it can be translucent and opalescent and it is valued https://www.propanraya.com/id/produk/eco-gypsum-ee-4050