Titanomaghemite (original) (raw)

A valid IMA mineral species

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About TitanomaghemiteHide

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Formula:

(Ti4+0.5◻0.5)Fe3+2O4

Name:

In allusion to its titanium content and relationship to maghemite.

May form by natural oxidation of original titanomagneite.

Occurs as inclusions in hematite in sea-floor basalt (Mid-Atlantic Ridge).
Also as grains in a doleritic intrusion in an area of Precambrian gneiss in Minas Gerais, Brazil; the grains host exsolution lamellae of ilmenite parallel to {111} (Allan et al., 1989).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:29152:9

0154ff1d-e9ec-4184-a2fc-0770e6b4fe44

IMA Classification of TitanomaghemiteHide

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IMA status notes:

Redefined by the IMA

IMA Formula:

(Ti0.5◻0.5)Fe3+2O4

Approval history:

Grandfathered (first described prior to 1959).
Marked as a questionable mineral in IMA list of Minerals as Fe(Fe,Ti)2O4.
2018: Redefined by IMA as (Ti4+0.5◻0.5)Fe2O4 (Bosi et al., 2019).

Classification of TitanomaghemiteHide

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4.BB.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol Source Reference
Tmgh IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of TitanomaghemiteHide

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Pronunciation:

Play Recorded by Country
Sorry, your browser doesn't support HTML5 audio. Jolyon Ralph United Kingdom

Chemistry of TitanomaghemiteHide

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Mindat Formula:

(Ti4+0.5◻0.5)Fe3+2O4

Crystallography of TitanomaghemiteHide

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Class (H-M):

432 - Gyroidal

Cell Parameters:

a = 8.348(3) Å

Unit Cell V:

581.76 ų (Calculated from Unit Cell)

Crystal StructureHide

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ID Species Reference Link Year Locality Pressure (GPa) Temp (K)
0001136 Titanomaghemite Collyer S, Grimes N W, Vaughan D J, Longworth G (1988) Studies of the crystal structure and crystal chemistry of titanomaghemite American Mineralogist 73 153-160 1988 Pretoria, South Africa 0 293

CIF Raw Data - click here to close

Geological EnvironmentHide

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Type Occurrence of TitanomaghemiteHide

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Place of Conservation of Type Material:

Natural History Museum, London, UK, specimen BM1929,1687, is considered as the neotype (Bosi et al. 2019)

Other Language Names for TitanomaghemiteHide

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Relationship of Titanomaghemite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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4.BB. Elgoresyite (Mg5Si2)O9 Mon. 2/m : _B_2/m
4.BB. Chenmingite FeCr2O4 Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
4.BB. Dellagiustaite V2+Al2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB. Thermaerogenite CuAl2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB. Chukochenite LiAl5O8 Orth. m m m _(_2/_m_2/_m_2/m ) : I m m a
4.BB. Garpenbergite Mn6◻AsSbO10(OH)2 Orth. m m m _(_2/_m_2/_m_2/m )
4.BB. Magnéliite Ti3+2Ti4+2O7 Tric. 1 : _P_1
4.BB. Jianmuite ZrTi4+Ti3+5Al3O16 Tet. 4 : _I_4
4.BB.05 Chromite Fe2+Cr3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Cochromite CoCr2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Coulsonite Fe2+V3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Cuprospinel Cu2+Fe3+2O4 Iso. m_3_m _(_4/_m_32/m )
4.BB.05 Filipstadite (Fe3+0.5Sb5+0.5)Mn2O4 Iso.
4.BB.05 Franklinite Zn2+Fe3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Gahnite ZnAl2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Galaxite Mn2+Al2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Hercynite Fe2+Al2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Jacobsite Mn2+Fe3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Manganochromite Mn2+Cr2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Magnesiocoulsonite MgV2O4 Iso. m_3_m _(_4/_m_32/m )
4.BB.05 Magnesiochromite MgCr2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Magnesioferrite MgFe3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Magnetite Fe2+Fe3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Qandilite (Mg,Fe3+)2(Ti,Fe3+,Al)O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Spinel MgAl2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Trevorite Ni2+Fe3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Ulvöspinel TiFe2+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Vuorelainenite Mn2+V3+2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Zincochromite ZnCr2O4 Iso. m_3_m _(_4/_m_32/m ) : F d_3_m
4.BB.05 Harmunite CaFe2O4 Orth. m m m _(_2/_m_2/_m_2/m ) : P b c m
4.BB.05 Wernerkrauseite Ca(Fe3+,Mn3+)2Mn4+O6 Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
4.BB.05 Deltalumite (Al0.67◻0.33)Al2O4 Tet. 42_m_ : _P_4_m_2
4.BB.05 Guite Co2+Co3+2O4 Iso.
4.BB.10 Hausmannite Mn2+Mn3+2O4 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
4.BB.10 Hetaerolite ZnMn2O4 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
4.BB.10 Manganostibite (Mn,Fe)7SbAsO12 Orth. m m m _(_2/_m_2/_m_2/m )
4.BB.15 Maghemite (Fe3+0.67◻0.33)Fe3+2O4 Iso. 432 : _P_4132
4.BB.20 Tegengrenite (Mn3+0.5Sb5+0.5)Mg2O4 Trig. 3 : _R_3
4.BB.25 Xieite Fe2+Cr2O4 Orth. m m m _(_2/_m_2/_m_2/m )
4.BB.30 Carmeltazite ZrAl2Ti4O11 Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
4.BB.35 Feiite Fe2+2(Fe2+Ti4+)O5 Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m
4.BB.40 Maohokite MgFe2O4 Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
4.BB.45 Tschaunerite (Fe2+)(Fe2+Ti4+)O4 Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m

Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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References for TitanomaghemiteHide

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Reference List:

Allan, J.E., Coey, J.M.D., Sanders, I.S., Schertmann, U., Friedrich, G., Wiechowski, A. (1989) An occurrence of a fully-oxidized natural titanomaghemite in basalt. Mineralogical Magazine 53, 299-304.

Localities for TitanomaghemiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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