Important Update News

The RRUFF Project is being updated to improve its interface and content. The beta version of the update is accessible to the public at RRUFF.net. New data is only being added to the beta site. Please note that it is in development, and some components are not functional. Existing RRUFF.info links will resolve to the new site after RRUFF.net is officially released.

We are grateful to NASA for the funding of this effort.

Maghemite R140712


Name: Maghemite
RRUFF ID: R140712
Ideal Chemistry: (Fe3+0.670.33)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 (66) ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
DOWNLOADS:

  To download sample data,
  please select a specific
  orientation angle.

Direction of polarization of laser relative to fiducial mark:
X Min:    X Max:    X Sort:
BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R140712
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
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
DOWNLOADS:

X Min:    X Max:    X Sort:
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

Bernal J D, Dasgupta D R, Mackay A L (1959) The oxides and hydroxides of iron and their structural inter-relationships, Clay Minerals Bulletin, 4, 15-30

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]