Hydrothermal anhydrite in veins is often hydrated to gypsum by groundwater in in the vicinity of-area exposures. It is frequently associated with the minerals halite and sulfur. Gypsum is the commonest sulfate mineral.[seventeen] Pure gypsum is white, but other substances uncovered as impurities might give a wide array of colors https://www.propanraya.com/id/produk/eco-gypsum-ee-4050