Mineral - Hollandite
Hollandite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Ba(Mn⁴⁺,Mn²⁺)₈O₁₆
Unit Cell
Physical Properties
Hardness
6
Streak
black
Density
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgraysilver
Birefringence
Luster
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
fibrous, prismatic, radial, grape-shaped
Formation
Verwitterung, Metamorphose
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Hollandite