Gypsum, frequent sulfate mineral of good industrial significance, made up of hydrated calcium sulfate (CaSO4·2H2O). In very well-developed crystals the mineral typically has become termed selenite. The fibrous massive wide range contains a silky lustre and is named satin spar; it is actually translucent and opalescent and is also valued https://www.propanraya.com/id/produk/eco-gypsum-ee-4050