Gypsum, common sulfate mineral of good business significance, made up of hydrated calcium sulfate (CaSO4·2H2O). In very well-made crystals the mineral commonly has been known as selenite. The fibrous massive wide range provides a silky lustre and known as satin spar; it can be translucent and opalescent which is valued https://www.propanraya.com/id/produk/eco-gypsum-ee-4050