Mineral - Pyrolusite
Pyrolusite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
MnO₂
Unit Cell
Physical Properties
Hardness
6 - 6.5
Streak
black
Density
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgray
Birefringence
Luster
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
tetragonal
Point Group
Space Group
Habit
dendritic, acicular, radial, grape-shaped
Formation
hydrothermal, Oxidationszone von Mangan-Lagerstätten
Paragenesis
Twinning
Rarity
Very common
Synonyms
Pyrolusite