Wilkinsonite Mineral Data

General Wilkinsonite Information

Chemical Formula:

Na2Fe++4Fe+++2Si6O20

Composition:

Molecular Weight = 869.56 gm

Sodium 5.29 % Na 7.13 % Na₂O

Iron 38.53 % Fe 33.05 % FeO / 18.36 % Fe₂O₃

Silicon 19.38 % Si 41.46 % SiO₂

Oxygen 36.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Fe²⁺₄Fe³⁺₂Si₆O₂₀

Environment:

In an eruptive peralkaline trachyte.

IMA Status:

Approved IMA 1990

Locality:

At the Warrumbungle volcano and associated Bingie Grumble Mountain, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for John Frederick George Wilkinson, Emeritus Professor of Geology, University of New England, Armidale, Australia.

Name Pronunciation:

Wilkinsonite + Pronunciation

Synonym:

IMA1988-053

Wilkinsonite Image

Images:

Wilkinsonite

Comments: Black wilkinsonite grains with anorthoclase.
Location: Warrumbungle Volcano, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wilkinsonite Crystallography

Axial Ratios:

a:b:c =0.9577:1:0.8237

Cell Dimensions:

a = 10.355, b = 10.812, c = 8.906, Z = 2; alpha = 105.05°, beta = 96.63°, gamma = 125.2° V = 781.57 Den(Calc)= 3.69

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.149(1), 8.1(1), 2.696(0.8),

Crystal Structure:

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Burt J B , Downs R T , Costin G , Acta Crystallographica, Section E , 63 (2007) p.i122-i124, Single-crystal X-ray refinement of wilkinsonite, Na2Fe2+4Fe3+2Si6O20., Locality: Warrumbungle Volcano, central New South Wales, Australia

Physical Properties of Wilkinsonite

Color:

Black.

Diaphaneity:

Subtransparent to Opaque

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

brown

Optical Properties of Wilkinsonite

Gladstone-Dale:

CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.212,KC= 0.2197
Ncalc = 1.86

Optical Data:

Biaxial (+), a=1.79, b=1.79, g=1.9, bire=0.1100, 2V(Calc)=0, 2V(Meas)=10.

Calculated Properties of Wilkinsonite

Electron Density:

Bulk Density (Electron Density)=3.79 gm/cc
note: Specific Gravity of Wilkinsonite =3.90 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Wilkinsonite= 12.38 barns/electron
U=PE_Wilkinsonite x rElectron Density= 46.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wilkinsonite is Not Radioactive

Wilkinsonite Classification

Dana Class:

69.02.01a.08 (69)Inosilicate Chains with Side Branches or Loops

(69.02)with P>2

(69.02.01a)Aenigmatite and related species (Aenigmatite subgroup)

69.02.01a.01 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1

69.02.01a.02 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

69.02.01a.03 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1

69.02.01a.04 Krinovite NaMg2CrSi3O10 P1 1

69.02.01a.05 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

69.02.01a.06 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

69.02.01a.07 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1

69.02.01a.08 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

69.02.01a.09 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1

Strunz Class:

09.DH.45 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1

09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

09.DH.45 Krinovite NaMg2CrSi3O10 P1 1

09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1

09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 2₁/c 2/m

09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1

09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1

09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

Other Wilkinsonite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.75,p694-701,1990) OPTIC PROP.(Am.Min.,Vol.75,p694-701,1990)

See Also:

Links to other databases for Wilkinsonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Wilkinsonite Specimen Label here :

Wilkinsonite

Na2Fe++4Fe+++2Si6O20
Dana No: 69.02.01a.08 Strunz No: 09.DH.45
Locality:

Notes: