Map Of gypsum deposits in northern Ohio, black squares reveal the location of deposits, from "Geography of Ohio", 1923 Gypsum is Utilized in a wide variety of purposes: Salt Flats: Gypsum is a standard ingredient of salt flats, that are expansive, flat spots with a salt crust about the surface. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050