Gypsum, typical sulfate mineral of good industrial value, made up of hydrated calcium sulfate (CaSO4·2H2O). In well-developed crystals the mineral generally has long been referred to as selenite. The fibrous large wide variety provides a silky lustre and is known as satin spar; it is actually translucent and opalescent and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050