Postprint version. Published in Hyperfine Interactions, Volume 91, Issue 1, December 1, 1994, pages 847-851.
The definitive version is available at http://dx.doi.org/10.1007/BF02064617.
Mössbauer spectroscopic and magnetic measurements have been made on a novel magnetic protein produced by the controlled reconstitution of ferritin. The data indicate that the predominant mineral form in the iron-containing cores is maghemite (γ-Fe2O3) rather than magnetite (Fe3O4).