![]() In the United States, gypsum deposits are distributed in 22 states with a total of 69 mines, with the largest producing area in Fort Dodge, Iowa, followed by Canada. The world’s largest producer of gypsum is the United States. The gypsum in the oxidation zone of sulphide deposits is mainly caused by sulfides. ![]() It is layered or lenticular in the interlayer of limestone, red shale, marl and sandy clay. Gypsum formed in sea basins and lake basins is formed by evaporation of brine or hydration of anhydrite symbiosis with anhydrite, gypsum, etc. Gypsum usually can be fond in the form of crystals or deposits beds. Gypsum is a widely distributed mineral, which is mainly formed by sedimentation and weathering, and a few are found in hydrothermal sulphide deposits.
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