Iron Oxide Hematite type
Fe2O3
|
Chemical name
Iron Oxide Hematite type |
|
Mineral name
Hematite |
|
Chemical formula
Fe2O3 |
|
Melting point [°C]
1539 - 1569 |
|
Crystal system
trigonal |
|
Crystal Class
ditrigonal-scalenohedral (-3 2/m) |
|
Space Group
R-3c |
|
Unit cell
a [Å]:5.04 b [Å]:5.04 c [Å]:13.77 |
|
Molecular weight [g/mol]
159,70 |
|
Formula units
Z=6 |
|
Frequent crystal surfaces
{10-11}, {10-12}, {0001}, {10-18}, {11-23}, {01-14}, {01-11}, {11-20}, {1010}, {1120} |
|
Twinning
penetration and lamellar on {0001}, {10-12} and {10-12} |
|
Mohs hardness
5.5 - 6.5 |
|
Density [g/cm3]
5.2 - 5.3 |
|
Cleavage
none |
|
Fracture / Tenacity
brittle, in thin flakes elastic, uneven to conchoidal |
|
Color
metallic-gray, dull to bright red |
|
Streak
bright red to dark red |
|
Transparency
opaque |
|
Luster
metallic to splendent |
|
Optical character
uniaxial (-) |
|
Refractive Index
nω=3.150-3.220; nε=2.870-2.940 |
|
Birefringence δ
0.280 |
|
Pleochroism δ
moderate to strong |
|
Crystal growth method
Natural |
|
Maximum size
up to 20 x 20 mm |
