Transparency: Gypsum Can vary from transparent to translucent, based on the crystal development and presence of inclusions. Clear crystals let mild to go through Plainly, although translucent specimens let some gentle passage but appear cloudy or hazy. Gypsum are available in hydrothermal veins, which happen to be fractures in rocks https://www.propanraya.com/id/produk/eco-gypsum-ee-4050