Hydrothermal Anhydrite in veins is commonly hydrated to gypsum by groundwater in around-surface exposures. It is usually 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 a wide array of colors to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050