Gypsum Can be found in hydrothermal veins, which happen to be fractures in rocks full of mineral-prosperous fluids that originate from deep throughout the Earth's crust. Map of gypsum deposits in northern Ohio, black squares point out The situation of deposits, from "Geography of Ohio", 1923 Gypsum is used in https://www.propanraya.com/id/produk/eco-gypsum-ee-4050