Gypsum, prevalent sulfate mineral of great commercial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-formulated crystals the mineral generally is named selenite. The fibrous significant variety incorporates a silky lustre and known as satin spar; it's translucent and opalescent which is valued for ornaments and jewellery. Why Gypsum Might https://www.propanraya.com/id/produk/eco-gypsum-ee-4050