Hydrothermal anhydrite in veins is commonly hydrated to gypsum by groundwater in around-floor exposures. It is often associated with the minerals halite and sulfur. Gypsum is the most common sulfate mineral.[17] Pure gypsum is white, but other substances found as impurities may possibly give a wide array of hues to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050