Hydrothermal Anhydrite in veins is often hydrated to gypsum by groundwater in near-floor exposures. It is commonly affiliated with the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[17] Pure gypsum is white, but other substances observed as impurities might give a wide array of shades to regional https://www.propanraya.com/id/produk/eco-gypsum-ee-4050