iron ore

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