Gypsum, frequent sulfate mineral of wonderful commercial significance, composed of hydrated calcium sulfate (CaSO4·2H2O). In very well-designed crystals the mineral normally has been called selenite. The fibrous large variety provides a silky lustre and known as satin spar; it can be translucent and opalescent which is valued for ornaments and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050