Gypsum, common sulfate mineral of great industrial great importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In perfectly-produced crystals the mineral commonly is referred to as selenite. The fibrous substantial wide variety has a silky lustre and is called satin spar; it truly is translucent and opalescent and is valued for https://www.propanraya.com/id/produk/eco-gypsum-ee-4050