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Wilkinsonite Mineral Data
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General Wilkinsonite Information
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 Chemical Formula: |
Na2Fe++4Fe+++2Si6O20 |
| Composition: |
Molecular Weight = 869.56 gm |
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Sodium 5.29 % Na 7.13 % Na2O |
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Iron 38.53 % Fe 33.05 % FeO / 18.36 % Fe2O3 |
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Silicon 19.38 % Si 41.46 % SiO2 |
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Oxygen 36.80 % O |
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______ ______ |
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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 |
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Wilkinsonite Image |
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Images:
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Wilkinsonite Crystallography
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| 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 - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.149(1), 8.1(1), 2.696(0.8), |
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Physical Properties of Wilkinsonite
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| Color: |
Black. |
| Diaphaneity: |
Subtransparent to Opaque |
| Hardness: |
5 - Apatite |
| Luster: |
Vitreous (Glassy) |
| Streak: |
brown |
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Optical Properties of Wilkinsonite
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| 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. |
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Calculated Properties of Wilkinsonite
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| Electron Density: |
Bulk Density (Electron Density)=3.79 gm/cc
note: Specific Gravity of Wilkinsonite =3.90 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEWilkinsonite = 12.38 barns/electron
U=PEWilkinsonite x rElectron Density= 46.86 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wilkinsonite is Not Radioactive |
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Wilkinsonite Classification
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| Dana Class: |
69.02.01a.08 (69)Inosilicate Chains with Side Branches or Loops |
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(69.02)with P>2 |
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(69.02.01a)Aenigmatite and related species (Aenigmatite subgroup) |
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69.02.01a.01 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1 |
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69.02.01a.02 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri |
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69.02.01a.03 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1 |
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69.02.01a.04 Krinovite NaMg2CrSi3O10 P1 1 |
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69.02.01a.05 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1 |
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69.02.01a.06 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1 |
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69.02.01a.07 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1 |
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69.02.01a.08 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1 |
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69.02.01a.09 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1 |
| Strunz Class: |
09.DH.45 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DH -Inosilicates with 4-periodic single chains, Si4O12 |
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09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1 |
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09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri |
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09.DH.45 Krinovite NaMg2CrSi3O10 P1 1 |
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09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1 |
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09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1 |
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09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1 |
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09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m |
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09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1 |
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09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1 |
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09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1 |
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Other Wilkinsonite Information
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| 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 :
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Wilkinsonite
Na2Fe++4Fe+++2Si6O20
Dana No: 69.02.01a.08 Strunz No: 09.DH.45
Locality:
Notes:
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