Anglesite is a
lead sulfate mineral with the chemical formula PbSO
4. It occurs as an oxidation product of primary lead sulfide ore,
galena. Anglesite occurs as prismatic
orthorhombic crystals and earthy masses, and is isomorphous with
barite and
celestine. It contains 74% of
lead by mass and therefore has a high
specific gravity of 6.3. Color is white or gray with pale yellow streaks. It may be dark gray if impure.