Gypsum, frequent sulfate mineral of terrific commercial value, composed of hydrated calcium sulfate (CaSO4·2H2O). In properly-developed crystals the mineral normally has been identified as selenite. The fibrous significant wide variety includes a silky lustre and is termed satin spar; it really is translucent and opalescent which is valued for ornaments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050