Gypsum, typical sulfate mineral of excellent industrial worth, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-made crystals the mineral usually has been known as selenite. The fibrous substantial selection features a silky lustre and is termed satin spar; it can be translucent and opalescent which is valued for ornaments and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050