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Ilmenite

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Formula:
Fe2+TiO3
Colour:
Iron black or black
Lustre:
Metallic, Sub-Metallic
Hardness:
5 - 6
Specific Gravity:
4.68 - 4.76
Crystal System:
Trigonal
Member of:
Name:
Named in 1827 by Adolph Theodor Kupffer after its type locality in the Ilmen Mountains, Russia.
Dimorph of:
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Classification of IlmeniteHide

Approved, 'Grandfathered' (first described prior to 1959)
4.CB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
4.3.5.1

4 : SIMPLE OXIDES
3 : A2X3
7.9.15

7 : Oxides and Hydroxides
9 : Oxides of Ti

Physical Properties of IlmeniteHide

Metallic, Sub-Metallic
Transparency:
Opaque
Colour:
Iron black or black
Streak:
Black to reddish brown
Hardness:
5 - 6 on Mohs scale
Hardness:
VHN100=566 - 698 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
On {0001}, {1011} due to twinning (?).
Fracture:
Conchoidal, Sub-Conchoidal
Density:
4.68 - 4.76 g/cm3 (Measured)    4.789 g/cm3 (Calculated)

Optical Data of IlmeniteHide

Type:
Uniaxial (-)
Type:
Anisotropic
Anisotropism:
Strong in shades of gray
Bireflectance:
Strong O=pinkish brown E= dark brown
Colour in reflected light:
Greyish white with brown tint
Pleochroism:
Weak

Chemical Properties of IlmeniteHide

Formula:
Fe2+TiO3
IMA Formula:
Fe2+Ti4+O3
Common Impurities:
Mn,Mg,V

Crystallography of IlmeniteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 5.08854(7) Å, c = 14.0924(3) Å
Ratio:
a:c = 1 : 2.769
Unit Cell V:
316.01 ų (Calculated from Unit Cell)
Z:
6
Morphology:
Commonly thick tabular {0001}. Sometimes in thin laminae; also acute rhombohedral. Compact massive; as embedded grains.
Twinning:
1. On {0001}; 2. On {1011}, lamellar.

Crystallographic forms of IlmeniteHide

Crystal Atlas:
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Ilmenite no.1 - Goldschmidt (1913-1926)
Ilmenite no.2 - Goldschmidt (1913-1926)
Ilmenite no.29 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of IlmeniteHide

Synonyms of IlmeniteHide

Other Language Names for IlmeniteHide

Varieties of IlmeniteHide

Cr-rich PicroilmeniteA cromium- and magnesium-rich variety of ilmenite, containing up to 8.6% Cr2O3 and up to 17.0% MgO.
Ferrian IlmeniteIlmenite containing up to 33% Fe2O3 in solid-solution in the rhombohedral series Fe2O3-FeTiO3.
GuadarramiteA supposed radioactive variety of ilmenite
HystatiteA ferrian variety of ilmenite. On material from Arendal.
IserineA supposed cubic form of ilmenite.
Originally described from Jizerská meadow (Iser meadow), Jizerské Mts (Iser Mts), Liberec Region, Bohemia (Böhmen; Boehmen), Czech Republic.
KibdelophaneA high Ti Ilmenite
Magnesian Chromian IlmeniteA Mg-Cr-bearing variety from DeBeers mine (kimberlites), associated, i.a., with hawthorneite.
Magnesian ilmeniteA variety of ilmenite with some Mg replacing Fe2+.
Magnesian menaccaniteA magnesian variety of ilmenite.
MagnetoilmeniteA ferrian variety of ilmenite.
ManaccaniteA ferrian variety of Ilmenite. [Clark, 1993 - "Hey's Mineral Index"]
Originally reported from Tregonwell Mill, Manaccan, Lizard Peninsula, Cornwall, England, UK.
ManganilmeniteA manganian variety of ilmenite.
Manganoan IlmeniteA manganese-bearing variety of Ilmenite.
PicrocrichtoniteA magnesian variety of ilmenite.
PicroilmeniteA Mg-rich variety of ilmenite.
PicrotitaniteA magnesian variety of ilmenite.
Silico-ilmenitePossibly a solid solution of silica in Ilmenite
WashingtoniteA ferrian variety of ilmenite.

Relationship of Ilmenite to other SpeciesHide

Member of:
Other Members of this group:
Akimotoite(Mg,Fe2+)SiO3Trig.
Ecandrewsite(Zn,Fe2+,Mn2+)TiO3Trig. 3 : R3
GeikieliteMgTiO3Trig. 3 : R3
Hemleyite(Fe2+0.48Mg0.37Ca0.04Na0.04Mn2+0.03Al0.03Cr3+0.01)sum=1.00Si1.00O3Trig. 3 : R3
PyrophaniteMn2+TiO3Trig. 3 : R3
Unnamed (Fe-Cr Oxide)FeCrO3Trig. 3 : R3
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rutile80 photos of Ilmenite associated with Rutile on mindat.org.
Albite65 photos of Ilmenite associated with Albite on mindat.org.
Quartz62 photos of Ilmenite associated with Quartz on mindat.org.
Hematite54 photos of Ilmenite associated with Hematite on mindat.org.
Magnetite32 photos of Ilmenite associated with Magnetite on mindat.org.
Enstatite21 photos of Ilmenite associated with Enstatite on mindat.org.
Titanite20 photos of Ilmenite associated with Titanite on mindat.org.
Fluorapatite18 photos of Ilmenite associated with Fluorapatite on mindat.org.
Augite18 photos of Ilmenite associated with Augite on mindat.org.
Anatase15 photos of Ilmenite associated with Anatase on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.CB.05BrizziiteNaSb5+O3Trig. 3 : R3
4.CB.05CorundumAl2O3Trig. 3m (3 2/m) : R3c
4.CB.05Ecandrewsite(Zn,Fe2+,Mn2+)TiO3Trig. 3 : R3
4.CB.05EskolaiteCr2O3Trig.
4.CB.05GeikieliteMgTiO3Trig. 3 : R3
4.CB.05HematiteFe2O3Trig. 3m (3 2/m) : R3c
4.CB.05KarelianiteV3+2O3Trig.
4.CB.05MelanostibiteMn2+(Sb5+,Fe3+)O3Trig.
4.CB.05PyrophaniteMn2+TiO3Trig. 3 : R3
4.CB.05Akimotoite(Mg,Fe2+)SiO3Trig.
4.CB.05AuroantimonateAuSbO3
4.CB.05UM1998-11-O-AuHSbAu+2Sb3+O2(OH)
4.CB.05TistariteTi3+2O3Trig. 3m (3 2/m) : R3c
4.CB.10AvicenniteTl2O3Iso. m3 (2/m 3) : Ia3
4.CB.10BixbyiteMn3+2O3Iso. m3 (2/m 3) : Ia3
4.CB.15Armalcolite(Mg,Fe2+)Ti2O5Orth. mmm (2/m 2/m 2/m)
4.CB.15PseudobrookiteFe2TiO5Orth. mmm (2/m 2/m 2/m)
4.CB.20Zincohögbomite-2N2S[(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2Hex. 6mm : P63mc
4.CB.20Zincohögbomite-2N6S[(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2Hex. 6mm : P63mc
4.CB.20Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6Trig. 3m (3 2/m) : R3m
4.CB.20Magnesiohögbomite-2N3S[(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2Trig. 3m (3 2/m) : P3 1m
4.CB.20Magnesiohögbomite-2N2S[(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2Hex. 6mm : P63mc
4.CB.20Ferrohögbomite-6N12S[(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6Trig. 3m (3 2/m) : R3m
4.CB.25PseudorutileFe2Ti3O9Hex.
4.CB.25KleberiteFeTi6O11(OH)5Mon. 2/m : P21/b
4.CB.30BerdesinskiiteV3+2TiO5Mon.
4.CB.30OxyvaniteV3+2V4+O5Mon. 2/m : B2/b
4.CB.35Olkhonskite(Cr,V)2Ti3O9Mon.
4.CB.35SchreyeriteV3+2Ti3O9Mon.
4.CB.40KamiokiteFe2Mo3O8Hex.
4.CB.40Nolanite(V3+,Fe3+,Fe2+,Ti)10O14(OH)2Hex.
4.CB.40RinmaniteZn2Sb2Mg2Fe4O14(OH)2Hex. 6 : P63
4.CB.40IseiteMn2Mo3O8Hex. 6mm : P63mc
4.CB.40MajindeiteMg2Mo3O8Hex. 6mm : P63mc
4.CB.45ClaudetiteAs2O3Mon. 2/m
4.CB.45StibioclaudetiteAsSbO3Mon. 2/m : P21/m
4.CB.50ArsenoliteAs2O3Iso. m3m (4/m 3 2/m) : Fd3m
4.CB.50SenarmontiteSb2O3Iso. m3m (4/m 3 2/m) : Fd3m
4.CB.55ValentiniteSb2O3Orth. mmm (2/m 2/m 2/m) : Pccn
4.CB.60BismiteBi2O3Mon. 2/m : P21/b
4.CB.65SphaerobismoiteBi2O3Tet.
4.CB.70SilléniteBi12SiO20Iso. 2 3 : I2 3
4.CB.75KyzylkumiteV3+Ti2O5(OH)Mon. 2/m : P21/b
4.CB.80TietaiyangiteFe3+4Fe2+TiO9Hex.

Related Minerals - Dana Grouping (8th Ed.)Hide

4.3.5.2GeikieliteMgTiO3Trig. 3 : R3
4.3.5.3PyrophaniteMn2+TiO3Trig. 3 : R3
4.3.5.4Ecandrewsite(Zn,Fe2+,Mn2+)TiO3Trig. 3 : R3
4.3.5.5MelanostibiteMn2+(Sb5+,Fe3+)O3Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.9.1HongquiiteTiO
7.9.2RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.9.3AnataseTiO2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
7.9.4BrookiteTiO2Orth. mmm (2/m 2/m 2/m)
7.9.5GeikieliteMgTiO3Trig. 3 : R3
7.9.6PerovskiteCaTiO3Orth. mmm (2/m 2/m 2/m) : Pnma
7.9.7KassiteCaTi2O4(OH)2Orth.
7.9.8TausoniteSrTiO3Iso. 4 3m
7.9.9CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38Trig. 3 : R3
7.9.10Lucasite-(Ce)CeTi2(O,OH)6Mon.
7.9.11Hibonite(Ca,Ce)(Al,Ti,Mg)12O19Hex.
7.9.12Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6Amor.
7.9.13PyrophaniteMn2+TiO3Trig. 3 : R3
7.9.14IwakiiteMn2+Fe3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
7.9.16PseudobrookiteFe2TiO5Orth. mmm (2/m 2/m 2/m)
7.9.17UlvöspinelFe2TiO4Iso.
7.9.18PseudorutileFe2Ti3O9Hex.
7.9.19FreudenbergiteNa2(Ti,Fe)8O16Mon.
7.9.20KennedyiteFe2TiO5
7.9.21Armalcolite(Mg,Fe2+)Ti2O5Orth. mmm (2/m 2/m 2/m)
7.9.22Högbomite(Mg,Fe)2(Al,Ti)5O10Hex.
7.9.23Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
7.9.24CafetiteCaTi2O5 · H2OMon. 2/m : P21/b
7.9.25Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38Trig.
7.9.26Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38Trig.
7.9.27PrideriteK(Ti4+7Fe3+)O16Tet.
7.9.28Jeppeite(K,Ba)2(Ti,Fe)6O13Mon.
7.9.29AnkangiteBa(Ti,V3+,Cr)8O16Tet. 4/m : I4/m
7.9.30Ecandrewsite(Zn,Fe2+,Mn2+)TiO3Trig. 3 : R3
7.9.31LandauiteNaMnZn2(Ti,Fe)6Ti12O38Trig. 3 : R3

Other InformationHide

Notes:
Weakly magnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Ilmenite in petrologyHide

An essential component of (items highlighted in red)
Common component of (items highlighted in red)
Accessory component of (items highlighted in red)

References for IlmeniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 534-541.
Neumann, E.-R. (1974): The distribution of Mn2+ and Fe2+ between ilmenites and magnetites in igneous rocks. American Journal of Science: 274: 1074-1088.
Grew, E.S. (1980): Sillimanite and ilmenite from high-grade metamorphic rocks of Antarctica and other areas. Journal of Petrology: 21: 39-68.
Arculus, R.J., Dawson, J.B., Mitchell, R.H., Gust, D.A., and Holmes, R.D. (1984): Oxidation states of the upper mantle recorded by megacryst ilmenite in kimberlite and type A and B spinel Iherzolites. Contributions to Mineralogy and Petrology: 85: 85-94.
Mineralogical Journal (Japan) (1989): 14: 179.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1995) Handbook of Mineralogy, Volume II. Silica, Silicates. Mineral Data Publishing, Tucson, AZ, 904pp., 2 volumes: 264.

Internet Links for IlmeniteHide

Localities for IlmeniteHide

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 ListShow