Maghemite R140712

Name: Maghemite
RRUFF ID: R140712
Ideal Chemistry: (Fe3+0.67   0.33)Fe3+2O4
Locality: Katzenbuckel, Eberbach, Odenwald, Baden-Württemberg, Germany
Source: Rock Currier [view label]
Owner: RRUFF
Description: Black aggregate of small to fine grains. Fd3m symmetry
Status: The identification of this mineral has been confirmed only by single crystal X-ray diffraction.
Mineral Group: [ Spinel (63) ]
Sample Description: Unoriented sample

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RRUFF ID: R140712
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R140712.9
Sample Description: Single crystal, powder profile is calculated, Fd3m
Cell Refinement Output: a: 8.3985(83)Å    b: 8.3985(83)Å    c: 8.3985(83)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 592.390(87)Å3    Crystal System: cubic

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REFERENCES for Maghemite

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

Wagner P A (1927) Changes in the oxidation of iron in magnetite, Economic Geology, 22, 845-846   [view file]

Schairer J F (1929) New mineral names, American Mineralogist, 14, 387-388   [view file]

Sinha K P, Sinha A P B (1957) Ein Fehlstellenüberstruktur - Modell für γ-Fe2O3, Zeitschrift für Anorganische und Allgemeine Chemie, 293, 228-232

Greaves C (1983) A powder neutron diffraction investigation of vacancy ordering and covalence in γ-Fe2O3, Journal of Solid State Chemistry, 49, 325-333

Banin A, Ben-Shlomo T, Margulies L, Blake D F, Mancinelli R L (1993) The nanophase iron mineral(s) in Mars soil, Journal of Geophysical Research, 98, 20831-20853

Pecharromán C, González-Carreño T, Iglesias J E (1995) The infrared dielectric properties of maghemite, ϒ-Fe2O3, from reflectance measurement on pressed powders, Physics and Chemistry of Minerals, 22, 21-29

Shmakov A N, Kryukova G N, Tsybulya S V, Chuvilin A L, Solovyeva L P (1995) Vacancy ordering in γ-Fe2O3: synchotron X-ray powder diffraction and high-resolution electron microscopy studies, Journal of Applied Crystallography, 28, 141-145

de Faria D L A, Silva S V, de Oliveira M T (1997) Raman microspectroscopy of some iron oxides and oxyhydroxides, Journal of Raman Spectroscopy, 28, 873-878   [link]

Oh S J, Cook D C, Townsend H E (1998) Characterization of iron oxides commonly formed as corrosion products on steel, Hyperfine Interactions, 112, 59-65   [link]

Shin HS (1998) A study on the structure of maghemite (γ-Fe2O3) I. Rietveld analysis of powder XRD patterns, Journal of the Korean Ceramic Society, 35, 1113-1119

Frankel R B, Bazylinski D A (2003) Biologically induced mineralization by bacteria, Reviews in Mineralogy and Geochemistry, 54, 95-114

Jesus A P, Mateus A, Waerenborgh J C, Figueiras J, Alves L C, Oliveira V (2003) Hypogene titanian, vanadian maghemite in reworked oxide cumulates in the Beja layered gabbro complex, Odivelas, southeastern Portugal, The Canadian Mineralogist, 41, 1105-1124   [view file]

Yang J B, Zhou X D, Yelon W B, James W J, Cai Q, Gopalakrishnan K V, Malik S K, Sun X C, Nikles D E (2004) Magnetic and structural studies of the Verwey transition in Fe3–δO4 nanoparticles, Journal of Applied Physics, 95, 7540-7542

Cvejic Z, Rakic S, Kremenovic A, Antic B, Jovalekic C, Colomban P (2006) Nanosize ferrites obtained by ball milling: crystal structure, cation distribution, size-strain analysis and Raman investigations, Solid State Sciences, 8, 908-915

Jorgensen J E, Mosegaard L, Thomsen L E, Jensen T R, Hanson J C (2007) Formation of γ-Fe2O3 nanoparticles and vacancy ordering: an in situ x-ray powder diffraction study, Journal of Solid State Chemistry, 180, 180-185

Gotic M, Koscec G, Music S (2009) Study of the reduction and reoxidation of substoichiometric magnetite, Journal of Molecular Structure, 924-26, 347-354

Sakurai S, Namai A, Hashimoto K, Ohkoshi S (2009) First observation of phase transformation of all four Fe2O3 phases (γ->ε->β->α-phase), Journal of the American Chemical Society, 131, 18299-18303

Gorski C A, Scherer M M (2010) Determination of nanoparticulate magnetite stoichiometry by Mössbauer spectroscopy, acidic dissolution, and powder X-ray diffraction: A critical review, American Mineralogist, 95, 1017-1026

Solano E, Frontera C, Puig T, Obradors X, Ricart S, Ros J (2014) Neutron and X-ray diffraction study of ferrite nanocrystals obtained by microwave-assisted growth. A structural comparison with the thermal synthetic route, Journal of Applied Crystallography, 47, 414-420

Bosi F, Biagioni C, Pasero M (2019) Nomenclature and classification of the spinel supergroup, European Journal of Mineralogy, 31, 183-192   [view file]