Hydrothermal Anhydrite in veins is usually hydrated to gypsum by groundwater in near-floor exposures. It is frequently linked to the minerals halite and sulfur. Gypsum is the most common sulfate mineral.[17] Pure gypsum is white, but other substances uncovered as impurities might give a wide range of colours to regional https://www.propanraya.com/id/produk/eco-gypsum-ee-4050