Transparency: Gypsum Can range between clear to translucent, depending upon the crystal formation and presence of inclusions. Clear crystals allow light-weight to pass through Plainly, when translucent specimens permit some mild passage but surface cloudy or hazy. Gypsum are available in hydrothermal veins, which might be fractures in rocks full https://www.propanraya.com/id/produk/eco-gypsum-ee-4050