Hydrothermal Anhydrite in veins is usually hydrated to gypsum by groundwater in in close proximity to-area exposures. It is usually affiliated with the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[17] Pure gypsum is white, but other substances uncovered as impurities may well give a wide array https://www.propanraya.com/id/produk/eco-gypsum-ee-4050