Gypsum are available in hydrothermal veins, which might be fractures in rocks full of mineral-loaded fluids that originate from deep throughout the Earth's crust. Map of gypsum deposits in northern Ohio, black squares show The placement of deposits, from "Geography of Ohio", 1923 Gypsum is used in lots of programs: https://www.propanraya.com/id/produk/eco-gypsum-ee-4050