Gypsum, prevalent sulfate mineral of good professional relevance, composed of hydrated calcium sulfate (CaSO4·2H2O). In properly-designed crystals the mineral frequently has been known as selenite. The fibrous large range contains a silky lustre and known as satin spar; it is translucent and opalescent which is valued for ornaments and jewellery. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050