Besides Being plentiful, gypsum is well refined into a powder for plaster or formed into sheets of wallboard. Map of gypsum deposits in northern Ohio, black squares indicate The situation of deposits, from "Geography of Ohio", 1923 Gypsum is Employed in lots of applications: Pleochroism: Pleochroism refers into a mineral https://www.propanraya.com/id/produk/eco-gypsum-ee-4050