Hydrothermal anhydrite in veins is commonly hydrated to gypsum by groundwater in close to-area exposures. It is frequently connected to the minerals halite and sulfur. Gypsum is the most common sulfate mineral.[seventeen] Pure gypsum is white, but other substances found as impurities may possibly give a variety of colors to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050