Iron compounds: triiron tetraoxide

iron symbol icon

The iron in triiron tetraoxide formally is in the oxidation state 2, 3.

Crystal structure of triiron tetraoxide

Triiron tetraoxide

  • Formula as often written: Fe3O4
  • Hill system formula: Fe3O4
  • CAS registry number: [1317-61-9]
  • Formula weight: 231.533
  • Class: oxide


  • triiron tetraoxide
  • iron (II, III) oxide
  • iron oxide
  • lodestone
  • magnetite

Physical properties

  • Colour: black
  • Appearance: crystalline solid
  • Melting point: 1600°C
  • Boiling point:
  • Density: 5170 kg m-3


Coming soon...

Element analysis

Element percentages for the elements in triiron tetraoxide
Element %
Fe 72.36
O 27.64


Not available

Solid state structure

  • Geometry of iron:
  • Prototypical structure:

Crystal structure of triiron tetraoxide

Isotope pattern

What follows is the calculated isotope pattern for the Fe3O4 unit with the most intense ion set to 100%.

Formula: Fe3O4

mass  %
226   0.0 
227 0.0
228 1.2 _
229 0.0
230 18.9 _________
231 0.9
232 100.0 __________________________________________________
233 7.3 ____
234 1.9 _
235 0.1
236 0.0


The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

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