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PyrolusiteMnO2

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.

  

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