Gypsum, frequent sulfate mineral of great professional value, composed of hydrated calcium sulfate (CaSO4·2H2O). In nicely-made crystals the mineral usually is known as selenite. The fibrous significant wide variety contains a silky lustre and is termed satin spar; it is translucent and opalescent and is also valued for ornaments and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050