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Wilkinsonite Mineral Data

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General Wilkinsonite Information

Help on Chemical  Formula: Chemical Formula: Na2Fe++4Fe+++2Si6O20
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2Fe2+4Fe3+2Si6O20
Help on Environment: Environment: In an eruptive peralkaline trachyte.
Help on IMA Status: IMA Status: Approved IMA 1990
Help on Locality: Locality: At the Warrumbungle volcano and associated Bingie Grumble Mountain, New South Wales, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Frederick George Wilkinson, Emeritus Professor of Geology, University of New England, Armidale, Australia.
Help on Name Pronunciation: Name Pronunciation: Wilkinsonite + Pronunciation Say WILKINSONITE
Help on Synonym: Synonym: IMA1988-053
 

Wilkinsonite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9577:1:0.8237
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.149(1), 8.1(1), 2.696(0.8),
 

Physical Properties of Wilkinsonite

Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Subtransparent to Opaque
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brown
 

Optical Properties of Wilkinsonite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.212,KC= 0.2197
Ncalc = 1.86
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.79 gm/cc
note: Specific Gravity of Wilkinsonite =3.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEWilkinsonite = 12.38 barns/electron
U=PEWilkinsonite x rElectron Density= 46.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wilkinsonite is Not Radioactive
 

Wilkinsonite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.75,p694-701,1990) OPTIC PROP.(Am.Min.,Vol.75,p694-701,1990)
Help on See Also: 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:

 

 
   
 


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