Pyrolusite


Composition: MnO2
Crystal System : Tetragonal
Lustre : Metallic, dull
Hardness : 6.0-6.5
Specific Gravity : 5.06
References:

Bartelke (1976)

Occurrence

  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone