Gypsum, common sulfate mineral of good commercial significance, composed of hydrated calcium sulfate (CaSO4·2H2O). In perfectly-created crystals the mineral typically has long been called selenite. The fibrous enormous selection includes a silky lustre and is called satin spar; it can be translucent and opalescent and is also valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050