Hydrothermal anhydrite in veins is usually hydrated to gypsum by groundwater in near-surface area exposures. It is commonly related to the minerals halite and sulfur. Gypsum is the most common sulfate mineral.[seventeen] Pure gypsum is white, but other substances discovered as impurities may possibly give an array of hues to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050