Class: Oxide Hardness: 2 - 6.5 Density: 5.1 Streak: Black Lustre: Earthy Habit: Massive, compact, columnar or fibrous. Prismatic crystals are rare. Sometimes forms as dendritic coatings on other rocks. Colours: Black
Crystal System: Tetragonal Cleavage: Perfect Fracture: Uneven Magnetism: None Reaction with HCl: Very weak
Identification in hand sample: Will leave sooty marks if touched.
Associations: Found in bog and marine deposits
Industrial / ecomonic uses: Manganese is used to colour bricks.