Gypsum, widespread sulfate mineral of good industrial value, made up of hydrated calcium sulfate (CaSO4·2H2O). In well-designed crystals the mineral generally continues to be named selenite. The fibrous large variety provides a silky lustre and is termed satin spar; it is actually translucent and opalescent and is also valued for https://www.propanraya.com/id/produk/eco-gypsum-ee-4050