Hydrothermal Anhydrite in veins is often hydrated to gypsum by groundwater in close to-floor exposures. It is usually connected to the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[17] Pure gypsum is white, but other substances located as impurities could give a wide array of shades to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050