Hydrothermal anhydrite in veins is commonly hydrated to gypsum by groundwater in near-surface exposures. It is often associated with the minerals halite and sulfur. Gypsum is the commonest sulfate mineral.[17] Pure gypsum is white, but other substances identified as impurities may possibly give a wide array of colours to nearby https://www.propanraya.com/id/produk/eco-gypsum-ee-4050