Fluorescence: Fluorescence Is the property of a mineral to emit noticeable light-weight when subjected to ultraviolet radiation. Gypsum would not fluoresce below UV mild. Purely natural gypsum is mined from geological deposits. These deposits are generally present in sedimentary rock formations created with the evaporation of historic seas. Normal gypsum https://www.propanraya.com/id/produk/eco-gypsum-ee-4050