Hydrothermal Anhydrite in veins is commonly hydrated to gypsum by groundwater in near-floor exposures. It is frequently 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 might give a wide range of hues to local https://www.propanraya.com/id/produk/eco-gypsum-ee-4050