Gypsum, common sulfate mineral of terrific industrial importance, made up of hydrated calcium sulfate (CaSO4·2H2O). In very well-designed crystals the mineral typically has long been referred to as selenite. The fibrous massive wide variety contains a silky lustre and known as satin spar; it is translucent and opalescent and is https://www.propanraya.com/id/produk/eco-gypsum-ee-4050