Gypsum, widespread sulfate mineral of good industrial great importance, made up of hydrated calcium sulfate (CaSO4·2H2O). In properly-created crystals the mineral typically has been identified as selenite. The fibrous substantial variety features a silky lustre and known as satin spar; it's translucent and opalescent and is particularly valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050