Gypsum, widespread sulfate mineral of excellent commercial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In effectively-produced crystals the mineral frequently has long been referred to as selenite. The fibrous massive range has a silky lustre and is known as satin spar; it is translucent and opalescent and it is valued https://www.propanraya.com/id/produk/eco-gypsum-ee-4050