Mineral - Hematite
Hematite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Fe₂O₃
Unit Cell
a=5.04 c=13.77 Z=6
Physical Properties
Hardness
5 - 6
Streak
brownredred brown
Density
Heavy (3,5-6)
Cleavage
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackbrowngrayred
Birefringence
0.280
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
ditrigonal-scalenohedral - 3 m
Space Group
R 3 c (167)
Habit
prismatic, pyramidal, radial, Rhombohedron, rosette, tabular, grape-shaped, Cube
Formation
hydrothermal, Metasomatism, Sedimentary (marine, SEDEX, alluvial)
Paragenesis
Twinning
Contact twins after {10 1 0}
Rarity
Common
Synonyms
Hematite
Composition
Elements
Mass
Fe₂O₃
98.14
Mn₂O₃
0.54
FeO
1.29
MnO
0.38
New Jersey (Palache et al. 1952)
Groups and Members
Hematite-Group