Eirikite Mineral Data

General Eirikite Information

Chemical Formula:

KNa6Be2(Si15Al3)O39F2

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

Empirical Formula:

KNa₆Be₂Si₁₅Al₃O₃₉F₂

Environment:

Leifite group

IMA Status:

Proposed IMA 2007 (Dana # Added)

Locality:

Vesle Arøy island, Langesundsfjord district, Larvik community, Vestfold county, Norway Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Synonym:

IMA2007-017

Eirikite Image

Images:

Eirikite

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

Eirikite Crystallography

Axial Ratios:

a:c = 1:0.33874

Cell Dimensions:

a = 14.3865, c = 4.8733, Z = 2; beta = 110.445° V = 873.50 Den(Calc)= 5.17

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 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

Optical Data:

NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.2041) where Ncalc=Dcalc*KC+1

Calculated Properties of Eirikite

Electron Density:

Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Eirikite =5.17 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Eirikite= 1.84 barns/electron
U=PE_Eirikite x r_electron= 9.41 barns/cc.

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

Dana Class:

78.07.10.03 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.10)Dana Group

78.07.10.01 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m

78.07.10.02 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m

78.07.10.03 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m

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

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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Ask about Eirikite here :
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Print or Cut-and-Paste your Eirikite Specimen Label here :

Eirikite

KNa6Be2(Si15Al3)O39F2
Dana No: 78.07.10.03 Strunz No: 09.EH.25
Locality:

Notes: