Mineral - Brunogeierite
Brunogeierite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Ge⁴⁺Fe²⁺₂O₄
Unit Cell
Physical Properties
Hardness
5
Streak
black
Density
Heavy (3,5-6)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgray
Birefringence
Luster
Vitreous,
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
hexoctahedral - 4/m 3 2/m
Space Group
Fd 3 m (227)
Habit
Octahedron
Formation
Paragenesis
Twinning
Rarity
Rare
Synonyms
Brunogeierite
Groups and Members
Spinel-Supergroup
Oxyspinel-Group
Ulvöspinel-Subgroup