Gypsum, widespread sulfate mineral of excellent commercial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In effectively-produced crystals the mineral generally has been known as selenite. The fibrous huge wide range includes a silky lustre and is known as satin spar; it is translucent and opalescent and is valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050