Parsonsite is a lead uranium phosphate mineral with chemical formula: Pb₂(UO₂)(PO₄)₂·2H₂O. Parsonsite contains about 45% lead and 25% uranium. It forms elongated lathlike monoclinic crystals, radial spherulites, encrustations and powdery aggregates. It is of a light yellow colour. It has a Mohs hardness of 2.5-3 and a specific gravity of 5.72 - 6.29.