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