Hydrothermal Anhydrite in veins is often hydrated to gypsum by groundwater in in the vicinity of-floor exposures. It is usually connected 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 range of https://www.propanraya.com/id/produk/eco-gypsum-ee-4050