Gypsum, typical sulfate mineral of good commercial value, composed of hydrated calcium sulfate (CaSO4·2H2O). In very well-made crystals the mineral commonly continues to be known as selenite. The fibrous significant wide variety provides a silky lustre and is termed satin spar; it can be translucent and opalescent and it is https://www.propanraya.com/id/produk/eco-gypsum-ee-4050