Transparency: Gypsum Can range between clear to translucent, according to the crystal development and existence of inclusions. Clear crystals permit gentle to pass through Plainly, whilst translucent specimens permit some light passage but surface cloudy or hazy. Gypsum are available in hydrothermal veins, that happen to be fractures in rocks https://www.propanraya.com/id/produk/eco-gypsum-ee-4050