Transparency: Gypsum Can vary from transparent to translucent, depending on the crystal development and presence of inclusions. Clear crystals enable light-weight to go through clearly, although translucent specimens let some mild passage but surface cloudy or hazy. Gypsum can be found in hydrothermal veins, which are fractures in rocks full https://www.propanraya.com/id/produk/eco-gypsum-ee-4050