Hydrothermal Anhydrite in veins is commonly hydrated to gypsum by groundwater in near-surface exposures. It is frequently connected to the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[seventeen] Pure gypsum is white, but other substances located as impurities may well give an array of shades to neighborhood https://www.propanraya.com/id/produk/eco-gypsum-ee-4050