Gypsum, frequent sulfate mineral of good industrial value, made up of hydrated calcium sulfate (CaSO4·2H2O). In nicely-made crystals the mineral usually has been named selenite. The fibrous enormous wide range provides a silky lustre and is named satin spar; it is translucent and opalescent and it is valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050