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Wilkinsonite

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Big Photo

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

Show Wilkinsonite Photos (4)



Formula:
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
System:TriclinicColour:Black
Hardness:5
Member of:Aenigmatite Group > Sapphirine Supergroup
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
(Si
 
6
O
 
18
)O
 
2
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

Member of:Aenigmatite Group > Sapphirine Supergroup
Other Members of Group:

- +
Aenigmatite
Na
 
2
Fe
2+
5
Ti(Si
 
6
O
 
18
)O
 
2
Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
(Si
 
6
O
 
18
)O
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.DH.05Leucophanite
NaCaBeSi
 
2
O
 
6
F
9.DH.10Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)(Si
 
4
O
 
12
)(O,OH) · 2-3H
 
2
O
9.DH.15Haradaite
SrVSi
 
2
O
 
7
9.DH.15Suzukiite
BaVSi
 
2
O
 
7
9.DH.20Batisite
BaNaNaTi
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.20Shcherbakovite
(K,Ba)KNa(Ti,Nb)
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.25Taikanite
Sr
 
3
BaMn
2+
2
(Si
 
4
O
 
12
)O
 
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
Ti(Si
 
6
O
 
18
)O
 
2
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
(Si
 
6
O
 
18
)O
 
2
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
 
17
]O
 
3
(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
Si
 
4
O
 
10
F
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
]Si
 
8
O
 
22
(OH)
 
2
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
(Si
 
4
O
 
10
)
 
2
(OH,F)
 
4

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

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Wilkinsonite details from Handbook of Mineralogy (PDF)
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    • Localities for Wilkinsonite

    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.
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    (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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