Gypsum, typical sulfate mineral of wonderful commercial great importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-developed crystals the mineral commonly has been known as selenite. The fibrous significant range includes a silky lustre and known as satin spar; it's translucent and opalescent which is valued for ornaments and jewellery. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050