Gypsum, frequent sulfate mineral of fantastic professional worth, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-created crystals the mineral typically continues to be named selenite. The fibrous substantial range contains a silky lustre and is called satin spar; it's translucent and opalescent and it is valued for ornaments and jewellery. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050