Mineral - Chromite
Chromite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Fe²⁺Cr₂O₄
Unit Cell
Physical Properties
Hardness
5.5
Streak
brown
Density
Heavy (3,5-6)
Cleavage
Fracture
Tenacity
Brittle
Optical Properties
Color
black
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
hexoctahedral - 4/m 3 2/m
Space Group
Fd 3 m (227)
Habit
Octahedron
Formation
In orthomagmatic deposits, through metamorphism in serpentinites, in meteorites
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Chromite
Groups and Members
Spinel-Supergroup
Oxyspinel-Group
Spinel-Subgroup