Gypsum also occurs in crystal variety, with the two most common varieties staying significant apparent crystals that are frequently termed selenite, and fibrous crystals, called satin spar. ‘Selenite’ could be the Greek word for moon, and refers to the crystals perfectly-made pearl-like luster that could mirror a soft moon-like glow. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050