Property |
Specification |
Chemical Formula |
Fe₂O₃ (Hematite), Fe₃O₄ (Magnetite) |
Iron Content |
50% - 70% (depending on type) |
Color |
Dark gray, black, reddish-brown, or yellow-brown |
Hardness (Mohs Scale) |
4 - 6 |
Density |
2.5 - 7.0 g/cm³ (varies with type) |
Crystal System |
Trigonal (Hematite), Cubic (Magnetite) |
Luster |
Metallic to sub-metallic |
Cleavage |
Hematite: imperfect; Magnetite: none |
Fracture |
Uneven to conchoidal |
Streak |
Red to brown (Hematite), Black (Magnetite) |
Transparency |
Opaque |
Refractive Index |
N/A |
Specific Gravity |
5.0 - 7.5 |
Solubility |
Insoluble in water |
Magnetic Properties |
Magnetite is strongly magnetic; Hematite is non-magnetic |