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Eirikite Mineral Data

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General Eirikite Information

Help on Chemical  Formula: Chemical Formula: KNa6Be2(Si15Al3)O39F2
Help on Composition: Composition: Molecular Weight = 1,359.26 gm
   Potassium   2.88 %  K     3.46 % K2O
   Sodium     10.15 %  Na   13.68 % Na2O
   Beryllium   1.33 %  Be    3.68 % BeO
   Aluminum    5.96 %  Al   11.25 % Al2O3
   Silicon    30.99 %  Si   66.31 % SiO2
   Oxygen     45.91 %  O
   Fluorine    2.80 %  F     2.80 % F
                -   %   F    -1.18 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KNa6Be2Si15Al3O39F2
Help on Environment: Environment: Leifite group
Help on IMA Status: IMA Status: Proposed IMA 2007 (Dana # Added)
Help on Locality: Locality: Vesle Ar´┐Ży island, Langesundsfjord district, Larvik community, Vestfold county, Norway Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals, Nomenclature and Classification (CNMNC)
Help on Synonym: Synonym: IMA2007-017

Eirikite Image

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Comments: Radial aggregates of silky white eirikite crystals in matrix.
Location: Mt. Eveslogchorr, Chibiny, Kola, Russia. Scale: Not Given.
© Diederik Visser

Eirikite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.33874
Help on Cell Dimensions: Cell Dimensions: a = 14.3865, c = 4.8733, Z = 2; beta = 110.445° V = 873.50 Den(Calc)= 5.17
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.161(1), 3.386(0.7), 2.466(0.31),4.71(0.29), 4.153(0.21), 2.217(0.2), 2.398(0.19), 3.115(0.17),

Optical Properties of Eirikite

Help on Optical Data: Optical Data: NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.2041) where Ncalc=Dcalc*KC+1

Calculated Properties of Eirikite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Eirikite =5.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEEirikite = 1.84 barns/electron
U=PEEirikite x relectron= 9.41 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 41.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Eirikite per GRapi unit = 2.44 (%)

Estimated Radioactivity from Eirikite - barely detectable


Eirikite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.10)Dana Group Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 09.EH.25 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EH -Transitional structures between phyllosilicate and other silicate units
09.EH.25 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m
09.EH.25 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m
09.EH.25 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m

Other Eirikite Information

Help on See Also: See Also: Links to other databases for Eirikite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.EH.25





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