Gypsum, popular sulfate mineral of terrific professional worth, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-developed crystals the mineral generally is known as selenite. The fibrous substantial wide range provides a silky lustre and is named satin spar; it is translucent and opalescent and it is valued for ornaments and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050