Iron Oxide Magnetite type
Fe3O4
|
Chemical name
Iron Oxide Magnetite type |
|
Mineral name
Magnetite |
|
Chemical formula
Fe3O4 |
|
Melting point [°C]
1583 – 1597 |
|
Crystal system
cubic |
|
Crystal Class
cubic-hexoctahedral (4/m -3 2/m) |
|
Space Group
Fd-3m |
|
Unit cell
a [Å]:8.399 b [Å]:8.399 c [Å]:8.399 |
|
Formula units
Z=8 |
|
Frequent crystal surfaces
{111}, {110}, {100}, {111} |
|
Twinning
penetration twinning on (111) |
|
Mohs hardness
5.5 - 6.5 |
|
Density [g/cm3]
5.18 |
|
Cleavage
on (111) |
|
Fracture / Tenacity
uneven |
|
Color
black |
|
Streak
black |
|
Transparency
opaque, weakly translucent |
|
Luster
metallic (weak) |
|
Optical character
isotropic |
|
Refractive Index
n=2.42 |
|
Birefringence δ
none |
|
Maximum size
up to 10 x 10 mm |
