Gypsum, widespread sulfate mineral of wonderful industrial great importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In effectively-produced crystals the mineral usually has been identified as selenite. The fibrous significant wide range has a silky lustre and is called satin spar; it is actually translucent and opalescent and is particularly valued https://www.propanraya.com/id/produk/eco-gypsum-ee-4050