Gypsum, popular sulfate mineral of excellent commercial great importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-made crystals the mineral generally has become named selenite. The fibrous massive assortment includes a silky lustre and is named satin spar; it's translucent and opalescent and is also valued for ornaments and jewelry. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050