Gypsum, frequent sulfate mineral of excellent professional relevance, composed of hydrated calcium sulfate (CaSO4·2H2O). In nicely-designed crystals the mineral normally has become termed selenite. The fibrous massive variety incorporates a silky lustre and is named satin spar; it is translucent and opalescent and it is valued for ornaments and jewellery. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050