Fe3O4Cubic
Magnetite
Fe3O4
OxidesChemical FormulaFe3O4
Crystal SystemCubic
Mohs Hardness6
Specific Gravity5.17
ColorBlack
LusterMetallic
StreakBlack
CleavageNone
FractureConchoidal
Occurrence
Naturally magnetic variety of magnetite. Used as compass by ancient navigators.