Transparency: Gypsum Can range from clear to translucent, based on the crystal development and existence of inclusions. Clear crystals let gentle to go through Plainly, although translucent specimens allow for some light passage but surface cloudy or hazy. Gypsum are available in hydrothermal veins, which can be fractures in rocks https://www.propanraya.com/id/produk/eco-gypsum-ee-4050