Hydrothermal anhydrite in veins is often hydrated to gypsum by groundwater in in close proximity to-floor exposures. It is often linked to the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[17] Pure gypsum is white, but other substances identified as impurities may well give a wide range https://www.propanraya.com/id/produk/eco-gypsum-ee-4050