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Maghemite



Maghemite (Fe2O3, γ-Fe2O3) is a member of the family of iron oxides. It has the same structure as magnetite, that is, it is spinel ferrite and is also ferrimagnetic. Maghemite can be considered as an Fe(II)-deficient magnetite with formula (\mathrm{Fe}^\mathrm{III}_8)_A[\mathrm{Fe}^{\mathrm{III}}_{40/3}\square_{8/3}]_B\mathrm{O}_{32} where \square represents a vacancy, A indicates tetrahedral positioning and B octahedral.

Additional recommended knowledge

Maghemite was named in 1927. It is blue with a grey shade, white, or brown.[1] It has isometric crystals.[2] Maghemite is formed by the topotactic oxidation of magnetite.

See also

  • List of Minerals

References

  1. ^ Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "Dana's new mineralogy", pp. 229-230. John Wiley & Sons, 1997
  2. ^ Maghemite on Mindat
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Maghemite". A list of authors is available in Wikipedia.
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