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Akimotoite

A valid IMA mineral species
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04776940017761971801013.jpg
Akimotoite

Tenham meteorite, Tenham Station, Windorah, Barcoo Shire, Queensland, Australia
04776940017761971801013.jpg
Akimotoite

Tenham meteorite, Tenham Station, Windorah, Barcoo Shire, Queensland, Australia
09667380017761971738339.jpg
Akimotoite

Tenham meteorite, Tenham Station, Windorah, Barcoo Shire, Queensland, Australia
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About AkimotoiteHide

07237550017271928506836.jpg
Syun-iti Akimoto
Formula:
MgSiO3
May contain minor Fe2+ and Al.
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
4.0 (Calculated)
Crystal System:
Trigonal
Member of:
Ilmenite Group
Name:
Named in honor of Syun-iti Akimoto (秋本俊一) (December 20, 1925, Tokyo, Japan - July 14, 2004), of the Institute of Geophysics and Solid State Physics, University of Tokyo, specialist in high-pressure research, especially on phase relationships in the system (Mg,Fe)2SiO4 at mantle conditions.
Ilmenite Group. A high-pressure phase and the Mg-analogue of hemleyite and the Si-analogue of geikielite.


Unique IdentifiersHide

Mindat ID:
6794
Long-form identifier:
mindat:1:1:6794:8

IMA Classification of AkimotoiteHide

Classification of AkimotoiteHide

Strunz-mindat (2026):
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

Mineral SymbolsHide

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

SymbolSourceReference for Standard
AkiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of AkimotoiteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of AkimotoiteHide

Lustre:
Vitreous
Colour:
Colourless
Streak:
White
Density:
4.0 g/cm3 (Calculated)

Chemistry of AkimotoiteHide

Mindat Formula:
MgSiO3

May contain minor Fe2+ and Al.
Element Weights:
Element% weight
O47.812 %
Si27.977 %
Mg24.211 %

Calculated from ideal end-member formula.
Elements listed:
Mg, O, Si - search for minerals with similar chemistry

Crystallography of AkimotoiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 4.78(5) Å, c = 13.6(1) Å
Ratio:
a:c = 1 : 2.845
Unit Cell V:
269.11 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000870AkimotoiteHoriuchi H, Hirano M, Ito E, Matsui Y (1982) MgSiO3 (ilmenite-type): Single crystal X-ray diffraction study American Mineralogist 67 788-79319820293
CIF Raw Data - click here to close

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
6 : Secondary asteroid phases4.566-4.560

Type Occurrence of AkimotoiteHide

Type Locality:
ⓘ Tenham meteorite, Tenham Station, Windorah, Barcoo Shire, Queensland, Australia
General Appearance of Type Material:
Granular to 0.4 µm or platy columnar to 1.4 µm.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan, number NSM-MF-15125.
Geological Setting of Type Material:
In shock-metamorphosed melt veins in chondritic L-6 meteorites.
Associated Minerals at Type Locality:
MajoriteRingwoodite
Reference:
Tomioka, Naotaka, Fujino, Kiyoshi (1999) Akimotoite, (Mg,Fe)SiO3, a new silicate mineral of the ilmenite group in the Tenham chondrite. American Mineralogist, 84 (3) 267-271 doi:10.2138/am-1999-0307

Synonyms of AkimotoiteHide

Other Language Names for AkimotoiteHide

French:Akimotoite
German:Akimotoit
Norwegian:Akimotoitt
Spanish:Akimotoita

Relationship of Akimotoite to other SpeciesHide

Member of:
Ilmenite Group
Other Members of Ilmenite Group:
EcandrewsiteZnTiO3Trig. 3 : R3
GeikieliteMgTiO3Trig. 3 : R3
HemleyiteFe2+SiO3Trig. 3 : R3
IlmeniteFe2+TiO3Trig. 3 : R3
PyrophaniteMn2+TiO3Trig. 3 : R3
'Unnamed (Fe-Cr Oxide)'FeCrO3Trig. 3 : R3

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Akimotoite associated with BridgmaniteMgSiO3
1 photo of Akimotoite associated with Ringwoodite(Mg,Fe2+)2SiO4
1 photo of Akimotoite associated with MajoriteMg3(MgSi)(SiO4)3

Related Minerals - Strunz-mindat GroupingHide

4.CB.Magnesiohögbomite-6N12SMg5Al11TiO23(OH)Trig. 3m(32/m) : R3m
4.CB.KidoditeBaMg2Fe16O27Hex. 6/mmm(6/m2/m2/m) : P63/mmc
4.CB.Ferrohögbomite-2N2S[(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2Hex. 6mm : P63mc
4.CB.Zhenruite(MoO3)2 · H2OMon. 2/m : P21/m
4.CB.FuyuaniteMg7Nb6O18(OH)8Trig. 3 : P3
4.CB.VirgilluethiteMoO3 · H2OMon. 2/m : P21/b
4.CB.Pengite(Pb8Sb3+3)Σ11Sb5+9O35Trig. 3m(32/m) : R3m
4.CB.05BrizziiteNaSb5+O3Trig. 3 : R3
4.CB.05TistariteTi3+2O3Trig. 3m(32/m) : R3c
4.CB.05HematiteFe2O3Trig. 3m(32/m) : R3c
4.CB.05EcandrewsiteZnTiO3Trig. 3 : R3
4.CB.05MelanostibiteMn2+2Fe3+Sb5+O6Trig. 3 : R3
4.CB.05'UM1998-11-O-AuHSb'Au+2Sb3+O2(OH)
4.CB.05KarelianiteV3+2O3Trig. 3m(32/m) : R3c
4.CB.05CorundumAl2O3Trig. 3m(32/m) : R3c
4.CB.05EskolaiteCr2O3Trig. 3m(32/m) : R3c
4.CB.05GeikieliteMgTiO3Trig. 3 : R3
4.CB.05'Unnamed (Fe-Cr Oxide)'FeCrO3Trig. 3 : R3
4.CB.05'Auroantimonate'AuSbO3
4.CB.05HemleyiteFe2+SiO3Trig. 3 : R3
4.CB.05IlmeniteFe2+TiO3Trig. 3 : R3
4.CB.05PyrophaniteMn2+TiO3Trig. 3 : R3
4.CB.10Bixbyite-(Fe)(Fe,Mn)2O3Iso.
4.CB.10Bixbyite-(Mn)Mn3+2O3Iso. m3(2/m3) : Ia3
4.CB.10AvicenniteTl2O3Iso. m3(2/m3) : Ia3
4.CB.15ArmalcoliteMgTi4+2O5Orth. mmm(2/m2/m2/m)
4.CB.15FerropseudobrookiteFe2+Ti4+2O5Orth. mmm(2/m2/m2/m) : Cmcm
4.CB.15GriffiniteAl2Ti4+O5Orth. mmm(2/m2/m2/m) : Cmcm
4.CB.15Pseudobrookite Group
4.CB.15SassiteTi3+2Ti4+O5Orth. mmm(2/m2/m2/m) : Cmcm
4.CB.15PseudobrookiteFe3+2Ti4+O5Orth. mmm(2/m2/m2/m) : Cmcm
4.CB.20Zincovelesite-6N6SZn3(Fe3+,Mn3+,Al,Ti)8O15(OH)Trig. 3m(32/m) : P3m1
4.CB.20Magnesiohögbomite-2N4S(Mg8.43Fe2+1.57)Σ=10Al22Ti4+2O46(OH)2Hex. 6mm : P63mc
4.CB.20Magnesiobeltrandoite-2N3S(Mg6Al2)(Al18Fe3+2)O38(OH)2 Trig. 3m : P3m1
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(32/m) : R3m
4.CB.20Magnesiohögbomite-2N3S[(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2Trig. 3m(32/m) : P31m
4.CB.20Magnesiohögbomite-2N2S[(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2Hex. 6mm : P63mc
4.CB.20'Ferrohögbomite-6N12S'[(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6Trig. 3m(32/m) : R3m
4.CB.20Zincohögbomite-2N2S[(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2Hex. 6mm : P63mc
4.CB.25KleberiteFeTi6O11(OH)5Mon. 2/m : P21/b
4.CB.25PseudorutileFe3+2Ti4+3O9Hex. 622 : P6322
4.CB.30OxyvaniteV3+2V4+O5Mon. 2/m : B2/b
4.CB.30BerdesinskiiteV3+2TiO5Mon.
4.CB.30KaitianiteTi3+2Ti4+O5Mon. 2/m : B2/b
4.CB.35MachiiteAl2Ti3O9Mon. 2/m : B2/b
4.CB.35Vestaite(Ti4+Fe2+)Ti4+3O9Mon. 2/m : B2/b
4.CB.35Olkhonskite(Cr,V)2Ti3O9Mon.
4.CB.35SchreyeriteV3+2Ti4+3O9Mon. 2/m : B2/b
4.CB.40Zincorinmanite-(Zn)Zn2Sb2(Fe3+4Zn2)O14(OH)2Hex. 6mm : P63mc
4.CB.40MajindeiteMg2Mo3O8Hex. 6mm : P63mc
4.CB.40AlmagreraiteCuZnMn4+3O8Orth. mm2 : Pmn21
4.CB.40KamiokiteFe2Mo3O8Hex. 6mm : P63mc
4.CB.40NolaniteV3+8Fe3+2O14(OH)2Hex. 6mm : P63mc
4.CB.40IseiteMn2Mo3O8Hex. 6mm : P63mc
4.CB.40RinmaniteZn2Sb2Mg2Fe4O14(OH)2Hex. 6 : P63
4.CB.45StibioclaudetiteAsSbO3Mon. 2/m : P21/m
4.CB.45ClaudetiteAs2O3Mon. 2/m
4.CB.50SenarmontiteSb2O3Iso. m3m(4/m32/m) : Fd3m
4.CB.50ArsenoliteAs2O3Iso. m3m(4/m32/m) : Fd3m
4.CB.55ValentiniteSb2O3Orth. mmm(2/m2/m2/m) : Pccn
4.CB.60BismiteBi2O3Mon. 2/m : P21/b
4.CB.65SphaerobismoiteBi2O3Tet.
4.CB.70SilléniteBi12SiO20Iso. 23 : I23
4.CB.75KyzylkumiteV3+Ti2O5(OH)Mon. 2/m : P21/b
4.CB.80'Tietaiyangite'Fe3+4Fe2+TiO9Hex.
4.CB.85LiuiteFeTiO3Orth. mmm(2/m2/m2/m) : Pnma
4.CB.90LuogufengiteFe2O3Orth. mm2 : Pna21
4.CB.95WangdaodeiteFeTiO3Trig. 3m : R3c

Other InformationHide

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

Internet Links for AkimotoiteHide

References for AkimotoiteHide

Reference List:
Tomioka, Naotaka, Fujino, Kiyoshi (1999) Akimotoite, (Mg,Fe)SiO3, a new silicate mineral of the ilmenite group in the Tenham chondrite. American Mineralogist, 84 (3) 267-271 doi:10.2138/am-1999-0307
Hirose, Kei, Komabayashi, Tetsuya, Murakami, Motohiko, Funakoshi, Ken-ichi (2001) In situ measurements of the majorite-akimotoite-perovskite phase transition boundaries in MgSiO3. Geophysical Research Letters, 28 (23) 4351-4354 doi:10.1029/2001gl013549
Wentzcovitch, R. M.; Stixrude, L.; Karki, B. B.; Kiefer, B. (2004) Akimotoite to perovskite phase transition in MgSiO3. Geophysical Research Letters, 31 (10). p.L10611. doi:10.1029/2004gl019704
Miyajima, N., Goresy, A. E., Dupas-Bruzek, C., Seifert, F., Rubie, D. C., Chen, M., Xie, X. (2007) Ferric iron in Al-bearing akimotoite coexisting with iron-nickel metal in a shock-melt vein in an L-6 chondrite. American Mineralogist, 92 (10) 1545-1549 doi:10.2138/am.2007.2546
Ferroir, Tristan, Beck, Pierre, Van de Moortèle, Bertrand, Bohn, Marcel, Reynard, Bruno, Simionovici, Alexandre, El Goresy, Ahmed, Gillet, Philippe (2008) Akimotoite in the Tenham meteorite: Crystal chemistry and high-pressure transformation mechanisms. Earth and Planetary Science Letters, 275 (1) 26-31 doi:10.1016/j.epsl.2008.07.048
Chen, Ming, Xie, XianDe (2015) Shock-produced akimotoite in the Suizhou L6 chondrite. Science China Earth Sciences, 58 (6) 876-880 doi:10.1007/s11430-014-5039-5
Tschauner, O., Ma, C., Prescher, C., Prakapenka, V. B. (2018) Structure analysis and conditions of formation of akimotoite in the Tenham chondrite. Meteoritics & Planetary Science, 53 (1) 62-74 doi:10.1111/maps.13009
Kulka, Britany L., Dolinschi, Jonathan D., Leinenweber, Kurt D., Prakapenka, Vitali B., Shim, Sang-Heon (2020) The Bridgmanite–Akimotoite–Majorite Triple Point Determined in Large Volume Press and Laser-Heated Diamond Anvil Cell. Minerals, 10 (1) 67 doi:10.3390/min10010067
(2021) Akimotoite. Handbook of Mineralogy. Mineralogical Society of America
Su, Chang; Song, Wei; Yang, Guang; Liu, Yonggang; Li, Qingyi (2024) Pressure Effects on the Thermodynamic Properties of MgSiO3 Akimotoite. Crystals, 14 (10). p.837. doi:10.3390/cryst14100837

Localities for AkimotoiteHide

Showing 13 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • East Antarctica
    • American Highland
      • Grove Mountains
YT Lin et al. (2011)
Lu Feng et al. (2011)
    • Queen Maud Land
      • Queen Fabiola Mountains
Ozawa et al. (2007, December)
Kato et al. (2017)
Australia (TL)
 
  • Queensland
    • Barcoo Shire
      • Windorah
        • Tenham Station
T. Ferroir +2 other references
Canada
 
  • Alberta
    • Peace River
Tomioka et al. (2017)
China
 
  • Hubei
    • Suizhou
      • Zengdu District
        • Xihe
Chen et al. (2015) +2 other references
  • Jiangsu
    • Taizhou
      • Gaogang District
        • Sixiangkou
Zhang et al. (2006) +1 other reference
Morocco
 
  • Souss-Massa Region
    • Tata Province
      • Tata Cercle
Baziotis et al. (2013)
Nigeria
 
  • Katsina
    • Faskari
Zhidong Xie et al. (2005)
Oman
 
  • Dhofar Governorate
Litasov et al. (2019)
Litasov et al. (2019)
USA
 
  • Texas
    • Randall County
Zhidong Xie et al. (2005) +1 other reference
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