Parsonsite is a mineral of Uranium. Its chemical formula is: Pb2(UO2)(PO4)2•2(H2O) . Parsonsite contains about 45% Lead and 25% Uranium and is of a light yellow colour. It is named after Arthur Leonard Parsons (1873–1957), mineralogist, at the University of Toronto, Canada. It has a Mohs hardness of about 3.