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Wilkinsonite

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About WilkinsoniteHide

Formula:
Na2Fe2+4Fe3+2(Si6O18)O2
Colour:
Black
Lustre:
Vitreous
Hardness:
5
Crystal System:
Triclinic
Name:
Named in 1990 by M.B. Duggan in honor of John Frederick George Wilkinson (10 October 1927, Bundaberg, Queensland, Australia - 8 October 2014, Sydney, New South Wales, Australia), professor of geology, University of New England, Australia. He was a specialist in the petrology of igneous rocks.
Aenigmatite Group. The supposed Mg analogue is known as UM1991-29-SiO:FeMgNa.


Classification of WilkinsoniteHide

Approved
Approval Year:
1988
9.DH.40

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
69.2.1a.8

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
14.20.4

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals

Physical Properties of WilkinsoniteHide

Vitreous
Colour:
Black
Streak:
Brown
Hardness:

Optical Data of WilkinsoniteHide

Type:
Biaxial (+)
RI values:
nα = 1.790 nβ = 1.790 nγ = 1.900
2V:
Measured: 10°
Max Birefringence:
δ = 0.110
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
single

Chemical Properties of WilkinsoniteHide

Formula:
Na2Fe2+4Fe3+2(Si6O18)O2
IMA Formula:
Na4[Fe2+8Fe3+4]O4[Si12O36]
Common Impurities:
Ti,Zr,Al,Cr,Nb,Mn,Ni,Mg,Ca,K

Crystallography of WilkinsoniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.3355(5) Å, b = 10.784(4) Å, c = 8.9142(4) Å
α = 105.048(3)°, β = 96.461(3)°, γ = 125.302(2)°
Ratio:
a:b:c = 0.958 : 1 : 0.827
Unit Cell V:
738.37 ų
Z:
2

Type Occurrence of WilkinsoniteHide

Synonyms of WilkinsoniteHide

Other Language Names for WilkinsoniteHide

Relationship of Wilkinsonite to other SpeciesHide

Other Members of this group:
AenigmatiteNa2Fe2+5Ti(Si6O18)O2Tric. 1 : P1
KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
KuratiteCa2(Fe2+5Ti)O2[Si4Al2O18]Tric. 1 : P1
UM1991-29-SiO:FeMgNaNa4(Mg5Fe3+7)O4[Si9Fe3+3O36]

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aenigmatite1 photo of Wilkinsonite associated with Aenigmatite on mindat.org.
Arfvedsonite1 photo of Wilkinsonite associated with Arfvedsonite on mindat.org.
Anorthoclase1 photo of Wilkinsonite associated with Anorthoclase on mindat.org.
Sodalite1 photo of Wilkinsonite associated with Sodalite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DH.05LeucophaniteNaCaBeSi2O6FOrth. 2 2 2 : P21 21 21
9.DH.10OhmiliteSr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2OMon.
9.DH.15HaradaiteSrVSi2O7Orth.
9.DH.15SuzukiiteBaVSi2O7Orth.
9.DH.20BatisiteBaNaNaTi2(Si4O12)O2Orth.
9.DH.20Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth.
9.DH.25TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
9.DH.30KrauskopfiteBaSi2O5 · 3H2OMon.
9.DH.35Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon.
9.DH.35GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
9.DH.40AenigmatiteNa2Fe2+5Ti(Si6O18)O2Tric. 1 : P1
9.DH.40DorriteCa4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)Tric.
9.DH.40HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
9.DH.40KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
9.DH.40Makarochkinite(Ca,Na)2Fe2+4Fe3+Ti[O2|BeAlSi4O18]Tric. 1 : P1
9.DH.40RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
9.DH.40SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
9.DH.40WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
9.DH.45SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
9.DH.50Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4Mon. 2/m : P21/b
9.DH.55Surinamite(Mg,Fe)3Al4BeSi3O16Mon.
9.DH.60Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
9.DH.65HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
9.DH.65Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
9.DH.70JohninnesiteNa2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2Tric.
9.DH.75AgrelliteNaCa2Si4O10FTric.

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

69.2.1a.1AenigmatiteNa2Fe2+5Ti(Si6O18)O2Tric. 1 : P1
69.2.1a.2DorriteCa4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)Tric.
69.2.1a.3HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
69.2.1a.4KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
69.2.1a.5RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
69.2.1a.6SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
69.2.1a.7WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.20.1EmeleusiteLi2Na4Fe2Si12O30Orth.
14.20.2AegirineNaFe3+Si2O6Mon. 2/m : B2/b
14.20.5TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2OMon. 2/m : B2/m
14.20.6Riebeckite◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2Mon. 2/m : B2/m
14.20.7 Ferri-anniteKFe2+3((Fe3+,Al)Si3O10)(OH)2
14.20.8Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric.
14.20.9Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4

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.

References for WilkinsoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Duggan, M.B. (1990) Wilkinsonite, Na2Fe2+4Fe3+2Si6O20, a new member of the aenigmatite group from Warrumbungle, New South Wales, Australia. American Mineralogist: 75: 694-701.
Gaeta, M. and Mottana, A. (1991) Phase Relations of Aenigmatite Minerals in a Syenitic Ejectum, Wonchi Volcano, Ethiopia. Mineralogical Magazine: 55: 529-534.
Burt, D.M. (1994) Vector representation of some mineral compositions in the aenigmatite group, with special reference to høgtuvaite. Canadian Mineralogist: 32: 449-457.
Jensen B.B. (1996) Solid solution among members of the aenigmatite group. Mineralogical Magazine: 60: 982-986.
Mandarino, J.A. (1997) New Minerals 1990-1994. 211.
Kunzmann, T. (1999) The aenigmatite-rhönite mineral group. European Journal of Mineralogy: 11: 743-756.
Burt, J.B., Downs R.T., Costin, G. (2007) Single-crystal X-ray refinement of wilkinsonite. Acta Crystallographica: E63: i122-i124.
Grew, E.S., Hålenius, U., Pasero, M., Barbier, J. (2008) Recommended nomenclature for the sapphirine and surinamite group (sapphirine supergroup). Mineralogical Magazine: 72: 839-876.

Internet Links for WilkinsoniteHide

Localities for WilkinsoniteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • New South Wales
    • Gowen Co.
      • Warrumbungle National Park
[MinRec 22:387]; AM 1990, 694-701
Mongolia
 
  • Hovd Aimag (Khovd Aimag)
    • Altai Mts
      • Khaldzan Buragtag massif
Pavel M. Kartashov data
Yemen
 
  • Hadramawt Governorate
Lunar and Planetary Science XXXII (2001); Zolensky, M. & A.Ivanov, Chemie der Erde 63,185-246(2003)
Mineral and/or Locality  
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