Hydrothermal Anhydrite in veins is often hydrated to gypsum by groundwater in in close proximity to-surface area exposures. It is commonly related to the minerals halite and sulfur. Gypsum is the commonest sulfate mineral.[seventeen] Pure gypsum is white, but other substances observed as impurities may possibly give an array of https://www.propanraya.com/id/produk/eco-gypsum-ee-4050