Gypsum Also occurs in crystal kind, with the two most commonly encountered types being significant apparent crystals that are sometimes termed selenite, and fibrous crystals, called satin spar. ‘Selenite’ will be the Greek term for moon, and refers to the crystals perfectly-designed pearl-like luster which can reflect a tender moon-like https://www.propanraya.com/id/produk/eco-gypsum-ee-4050