Hydrothermal Anhydrite in veins is commonly hydrated to gypsum by groundwater in in the vicinity of-area exposures. It is frequently related to the minerals halite and sulfur. Gypsum is the most common sulfate mineral.[seventeen] Pure gypsum is white, but other substances uncovered as impurities might give an array of colours https://www.propanraya.com/id/produk/eco-gypsum-ee-4050