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Wilkinsonite

Big Photo

Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia
© Pavel M. Kartashov

Show Wilkinsonite Photos (2)
Formula:
Na
 
2
Fe
2+
4
Fe
3+
2
[O
 
2
|Si
 
6
O
 
18
]
System:TriclinicColour:Black
Hardness:5
Name:Named after John Frederick George Wilkinson (b. 1927), professor of geology, University of New England (Australia)


Aenigmatite Group

Classification of Wilkinsonite

IMA status:Approved 1988
Strunz 8th edition ID:8/F.14-30
Nickel-Strunz 10th (pending) edition ID:9.DH.40

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

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
Hey's CIM Ref.:14.20.4

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

Type Locality:Warrumbungle Volcano, Warrumbungle Mountains, Gowen Co., New South Wales, Australia
Year of Discovery:1990

Physical Properties of Wilkinsonite

Lustre:Vitreous
Colour:Black
Streak:Brown
Hardness (Mohs):5

Crystallography of Wilkinsonite

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 Volume:V 738.37 ų
Z:2

Optical Data of Wilkinsonite

Type:Biaxial (+)
RI values: nα = 1.790 nβ = 1.790 nγ = 1.900
2V:Measured: 10°
Maximum Birefringence:δ = 0.110

Chart 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 Wilkinsonite

Formula:
Na
 
2
Fe
2+
4
Fe
3+
2
[O
 
2
|Si
 
6
O
 
18
]
Essential elements:Fe, Na, O, Si
All elements listed in formula:Fe, Na, O, Si
Common Impurities:Ti,Zr,Al,Cr,Nb,Mn,Ni,Mg,Ca,K

Relationship of Wilkinsonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DH.05Leucophanite
NaCaBeSi
 
2
O
 
6
F
9.DH.10Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)[(O,OH)|(Si
 
2
O
 
6
)
 
2
] · 2-3H
 
2
O
9.DH.15Haradaite
SrVSi
 
2
O
 
7
9.DH.15Suzukiite
BaVSi
 
2
O
 
7
9.DH.20Batisite
Na
 
2
BaTi
 
2
[O|Si
 
2
O
 
6
]
 
2
9.DH.20Shcherbakovite
Na(K,Ba)
 
2
(Ti,Nb)
 
2
[O|Si
 
2
O
 
6
]
 
2
9.DH.25Taikanite
Sr
 
3
BaMn
2+
2
[O|Si
 
2
O
 
6
]
 
2
9.DH.30Krauskopfite
BaSi
 
2
O
 
5
·3H
 
2
O
9.DH.35Balangeroite
(Mg,Fe,Fe,Mn)
 
42
Si
 
16
O
 
54
(OH)
 
40
9.DH.35Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
9.DH.40Aenigmatite
Na
 
2
Fe
2+
5
TiO
 
2
(Si
 
6
O
 
18
)
9.DH.40Dorrite
Ca
 
2
(Mg,Fe
2+
 
)
 
2
Fe
3+
4
[O
 
2
|Al
 
4
Si
 
2
O
 
18
]
9.DH.40Høgtuvaite
(Ca,Na)
 
2
(Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|Be(Si,Al)
 
5
O
 
18
]
9.DH.40Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
[O
 
2
|Si
 
6
O
 
18
]
9.DH.40Makarochkinite
Ca
 
2
Fe
2+
4
Fe
3+
 
Ti[O
 
2
|BeAlSi
 
4
O
 
18
]
9.DH.40Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
9.DH.40Serendibite
(Ca,Na)
 
2
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
3
[O
 
2
|(Si,Al,B)
 
6
O
 
18
]
9.DH.40Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
9.DH.45Sapphirine
(Mg,Fe)
 
4-x
Al
 
4+x
[Al
 
4+x
Si
 
2-x
O
 
18
]O
 
2
9.DH.50Khmaralite
(Mg,Al,Fe)
 
16
[(Al,Si,Be)
 
12
O
 
36
]O
 
4
9.DH.55Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
9.DH.60Deerite
(Fe,Mn)
 
6
(Fe,Al)
 
3
Si
 
6
O
 
20
(OH)
 
5
9.DH.65Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
9.DH.65Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
9.DH.70Johninnesite
Na
 
2
Mn
2+
9
Mg
 
7
(OH)
 
8
[AsO
 
4
]
 
2
[Si
 
6
O
 
17
]
 
2
9.DH.75Agrellite
NaCa
 
2
[F|Si
 
4
O
 
10
]
Related Minerals - Hey's Index Grouping:

- +
14.20.1Emeleusite
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
14.20.2Aegirine
NaFe
3+
 
[Si
 
2
O
 
6
]
14.20.5Tuperssuatsiaite
Na
 
2
Fe
 
3
Si
 
8
O
 
20
(OH)
 
2
·4H
 
2
O
14.20.6Riebeckite
[ ][Na
 
2
][Fe
2+
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]
14.20.7 Ferri-annite
14.20.8Fenaksite
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
14.20.9Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
[(OH,F)
 
2
|Si
 
4
O
 
10
]
 
2

Other Names for Wilkinsonite

Synonyms:
IMA1988-053
Other Languages:
German:Wilkinsonit
Spanish:Wilkinsonita

Other Information

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

References for Wilkinsonite

Reference List:American Mineralogist (1990): 75: 694-701.

Mineralogical Magazine (1991): 55: 529.

New Minerals (1997), New Minerals 1990-1994.

J.B.Burt, et al. (2007): Single-crystal X-ray refinement of wilkinsonite. Acta Cryst. E63, i122-i124.

Internet Links for Wilkinsonite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Wilkinsonite in the Natural History Museum (London) online catalogue
  • Wilkinsonite details from Handbook of Mineralogy (PDF)
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    Localities for Wilkinsonite

    Hide Locality List
    The 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. ? 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.
    Australia
     
    • New South Wales
      • Gowen Co.
        • Warrumbungle Mountains
    		[MinRec 22:387]; AM 1990, 694-701
    Mongolia
     
    • Hovd Aimag (Khovd Aimag)
      • Altai Mts
        • Khaldzan Buragtag massif
    		Pavel M. Kartashov data
    Yemen
     
    • South Yemen
    		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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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 8th Nov 2009 13:57:06