Gypsum, prevalent sulfate mineral of excellent commercial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In nicely-produced crystals the mineral commonly has long been termed selenite. The fibrous massive variety provides a silky lustre and is referred to as satin spar; it is actually translucent and opalescent and it is valued https://www.propanraya.com/id/produk/eco-gypsum-ee-4050