Fluorescence: Fluorescence May be the residence of a mineral to emit obvious light when subjected to ultraviolet radiation. Gypsum does not fluoresce beneath UV gentle. Map of gypsum deposits in northern Ohio, black squares reveal the location of deposits, from "Geography of Ohio", 1923 Gypsum is Utilized in numerous types https://www.propanraya.com/id/produk/eco-gypsum-ee-4050