Mineral - Jacobsite
Jacobsite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
(Mn²⁺,Fe²⁺,Mg)(Fe³⁺,Mn³⁺)₂O₄
Unit Cell
Physical Properties
Hardness
5.5 - 6
Streak
blackbrownbrown black
Density
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackbrown
Birefringence
Luster
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Space Group
Habit
massive, Octahedron
Formation
Metamorphose, hydrothermal
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Jacobsite