Gypsum, widespread sulfate mineral of terrific industrial value, composed of hydrated calcium sulfate (CaSO4·2H2O). In very well-made crystals the mineral usually has become identified as selenite. The fibrous substantial assortment includes a silky lustre and is referred to as satin spar; it's translucent and opalescent and is also valued for https://www.propanraya.com/id/produk/eco-gypsum-ee-4050