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Iwakiite

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Formula:
Mn2+Fe3+2O4
Colour:
Greenish black
Hardness:
6 - 6½
Crystal System:
Tetragonal
Name:
Named after Iwaki city which is located near the type locality.
Dimorph of:
Compare hausmannite.

May be easily confused with its dimorph jacobsite.


Classification of Iwakiite

Approved
4.BB.10

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
7.2.6.2

7 : MULTIPLE OXIDES
2 : AB2X4
7.9.14

7 : Oxides and Hydroxides
9 : Oxides of Ti

Physical Properties of Iwakiite

Transparency:
Opaque
Colour:
Greenish black
Streak:
black
Hardness:
6 - 6½ on Mohs scale
Cleavage:
None Observed

Chemical Properties of Iwakiite

Formula:
Mn2+Fe3+2O4

Crystallography of Iwakiite

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/amd
Cell Parameters:
a = 6.02 Å, c = 8.54 Å
Ratio:
a:c = 1 : 1.419
Unit Cell V:
309.49 ų (Calculated from Unit Cell)

Type Occurrence of Iwakiite

Synonyms of Iwakiite

Other Language Names for Iwakiite

German:Iwakiit
Japanese:磐城鉱
Spanish:Iwakiita

Relationship of Iwakiite to other Species

Other Members of this group:
HausmanniteMn2+Mn3+2O4
HetaeroliteZnMn2O4
HydrohetaeroliteZnMn2O4 · H2O

Common Associates

Associated Minerals Based on Photo Data:
Adelite1 photo of Iwakiite associated with Adelite on mindat.org.
Calcite1 photo of Iwakiite associated with Calcite on mindat.org.
Manganophyllite1 photo of Iwakiite associated with Manganophyllite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

4.BB.05ChromiteFe2+Cr3+2O4
4.BB.05Cochromite(Co,Ni,Fe)(Cr,Al)2O4
4.BB.05CoulsoniteFe2+V3+2O4
4.BB.05CuprospinelCu2+Fe3+2O4
4.BB.05Filipstadite(Sb0.5Fe0.5)Mn2O4
4.BB.05FrankliniteZn2+Fe3+2O4
4.BB.05GahniteZnAl2O4
4.BB.05GalaxiteMn2+Al2O4
4.BB.05HercyniteFe2+Al2O4
4.BB.05JacobsiteMn2+Fe3+2O4
4.BB.05ManganochromiteMn2+Cr2O4
4.BB.05MagnesiocoulsoniteMgV2O4
4.BB.05MagnesiochromiteMgCr2O4
4.BB.05MagnesioferriteMgFe3+2O4
4.BB.05MagnetiteFe2+Fe3+2O4
4.BB.05Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
4.BB.05Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
4.BB.05SpinelMgAl2O4
4.BB.05TrevoriteNi2+Fe3+2O4
4.BB.05UlvöspinelFe2TiO4
4.BB.05VuorelaineniteMn2+V3+2O4
4.BB.05ZincochromiteZnCr2O4
4.BB.10HausmanniteMn2+Mn3+2O4
4.BB.10HetaeroliteZnMn2O4
4.BB.10HydrohetaeroliteZnMn2O4 · H2O
4.BB.15MaghemiteFe3+2O3
4.BB.15TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
4.BB.20Tegengrenite(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4
4.BB.25XieiteFe2+Cr2O4

Related Minerals - Hey's Chemical Index of Minerals Grouping

7.9.1HongquiiteTiO
7.9.2RutileTiO2
7.9.3AnataseTiO2
7.9.4BrookiteTiO2
7.9.5GeikieliteMgTiO3
7.9.6PerovskiteCaTiO3
7.9.7KassiteCaTi2O4(OH)2
7.9.8TausoniteSrTiO3
7.9.9CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38
7.9.10Lucasite-(Ce)CeTi2(O,OH)6
7.9.11Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
7.9.12Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
7.9.13PyrophaniteMn2+TiO3
7.9.15IlmeniteFe2+TiO3
7.9.16PseudobrookiteFe2TiO5
7.9.17UlvöspinelFe2TiO4
7.9.18PseudorutileFe2Ti3O9
7.9.19FreudenbergiteNa2(Ti,Fe)8O16
7.9.20KennedyiteFe2TiO5
7.9.21Armalcolite(Mg,Fe2+)Ti2O5
7.9.22Högbomite(Mg,Fe)2(Al,Ti)5O10
7.9.23Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
7.9.24CafetiteCaTi2O5 · H2O
7.9.25Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38
7.9.26Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
7.9.27PrideriteK(Ti4+7Fe3+)O16
7.9.28Jeppeite(K,Ba)2(Ti,Fe)6O13
7.9.29AnkangiteBa(Ti,V3+,Cr)8O16
7.9.30Ecandrewsite(Zn,Fe2+,Mn2+)TiO3
7.9.31LandauiteNaMnZn2(Ti,Fe)6Ti12O38

Related Minerals - Dana Grouping (8th Ed.)

7.2.6.1KusachiiteCuBi2O4

Other Information

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

References for Iwakiite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 65: 406.
Zeitschrift für Kristallographie (1988): 185: 605.

Internet Links for Iwakiite

mindat.org URL:
https://www.mindat.org/min-2058.html
Please feel free to link to this page.

Localities for Iwakiite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Japan (TL)
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Iwaki City
S. Matsubara, A. Kato, K. Nagashima: Japan. Mineral. J. 9:383-391 (1979); Amer. Mineral. 65:406 (1980); Matsubara, S., Miyawaki, R., Kato, A., Matsuyama, F., Mouri, T. and Suzuki, Y. (2001): Arseniopleite from the Gozaisho mine, Fukushima Prefecture, Japan. Bull. Natn. Sci. Mus., Tokyo, Ser. C, 27, 51-62. ; Mineralogical Journal Vol. 18 (1996) , No. 4 pp 155-160
Romania
 
  • Maramureș Co.
http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20.
Sweden
 
  • Dalarna
    • Hedemora
      • Garpenberg
(Kjell Gatedal); Grensman, F., Kalinowski, M.P. and Sandström, F. (2001): Garpenberg Norra. Litofilen. 18 (2), 26-46.
  • Värmland
    • Filipstad
K.Gatedal
      • Nordmark district
        • Jakobsberg ore field
Gatedal, K. (1994): Iwakiit från Jakobsberg och Harstigen. Långbansnytt. vol 10 [reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 82]
      • Persberg district
        • Pajsberg
Gatedal, K. (1991): Jakobsit, barysilit och Mn-vesuvian från Harstigen. Långbansnytt. vol 7 [reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 82-83]; Gatedal, K. (1994): Iwakiit från Jakobsberg och Harstigen. Långbansnytt. vol 10 [reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 82]
UK
 
  • Wales
    • Gwynedd
      • Lleyn Peninsula
        • Llanfaelrhys
          • Rhiw
UK Journal of mines & Minerals, number 29 pp47-48
Mineral and/or Locality  
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