Hydrothermal Anhydrite in veins is commonly hydrated to gypsum by groundwater in around-floor exposures. It is often related to the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[seventeen] Pure gypsum is white, but other substances identified as impurities may give a wide array of shades to community https://www.propanraya.com/id/produk/eco-gypsum-ee-4050