Hydrothermal anhydrite in veins is commonly hydrated to gypsum by groundwater in around-floor exposures. It is commonly linked to the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[seventeen] Pure gypsum is white, but other substances found as impurities may give a wide range of shades to nearby https://www.propanraya.com/id/produk/eco-gypsum-ee-4050