Gypsum, frequent sulfate mineral of good commercial worth, composed of hydrated calcium sulfate (CaSO4·2H2O). In perfectly-formulated crystals the mineral typically is known as selenite. The fibrous significant assortment includes a silky lustre and is termed satin spar; it can be translucent and opalescent and is valued for ornaments and jewellery. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050