Occurs in Pinal County.
Chemical Formula: PbO2
Specific Gravity: 9.1-9.2
Luster: Adamantine to dull
Hardness: 5-5.5
Plattnerite is a lead dioxide mineral that often appears as black to dark brown crystals or coatings. It is found in the oxidation zones of lead ore deposits.
Next Pinal County mineral: Plumbonacrite