Gypsum, frequent sulfate mineral of good business value, composed of hydrated calcium sulfate (CaSO4·2H2O). In properly-formulated crystals the mineral frequently has been identified as selenite. The fibrous significant wide variety has a silky lustre and is known as satin spar; it can be translucent and opalescent and is valued for https://www.propanraya.com/id/produk/eco-gypsum-ee-4050