Mineralogy Database

Elpasolite Mineral Data

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General Elpasolite Information

Help on Chemical  Formula: Chemical Formula: K2NaAlF6
Help on Composition: Composition: Molecular Weight = 242.16 gm
   Potassium  32.29 %  K    38.90 % K2O
   Sodium      9.49 %  Na   12.80 % Na2O
   Aluminum   11.14 %  Al   21.05 % Al2O3
   Fluorine   47.07 %  F    47.07 % F
                -   %   F   -19.82 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2NaAlF6
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1883
Help on Locality: Locality: St Peters Dome, El Paso County, Colorado, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Name Pronunciation: Name Pronunciation: Elpasolite + Pronunciation Say ELPASOLITE
Help on Synonym: Synonym: ICSD 6027
  PDF 22-1235

Elpasolite Image

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Comments: Colorless crystal of elpasolite in matrix.
Location: Cetine di Cotorniano mine (Cetine mine), Rosia, Siena, Tuscany, Italy. Scale: Picture size 2.5 mm.
© Thomas Witzke / Abraxas-Verlag

Elpasolite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.122, Z = 4; V = 535.78 Den(Calc)= 3.00
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.868(1), 2.03(0.9), 2.345(0.75),

Physical Properties of Elpasolite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.995
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Elpasolite

Help on Optical Data: Optical Data: Isotropic, n=1.376.

Calculated Properties of Elpasolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Elpasolite =3.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0000387498
Boson Index = 0.9999612502
Help on Photoelectric: Photoelectric: PEElpasolite = 4.02 barns/electron
U=PEElpasolite x relectron= 11.56 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 446.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Elpasolite per GRapi unit = 0.22 (%)

Estimated Radioactivity from Elpasolite - barely detectable


Elpasolite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.06)with miscellaneous formulae
  (11.06.02)Dana Group Elpasolite K2NaAlF6 F m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 03.CB.15 03 - HALIDES
  03.C - Complex Halides
  03.CB -Neso-aluminofluorides
03.CB.15 Cryolite Na3AlF6 P 21/n 2/m
03.CB.15 Elpasolite K2NaAlF6 F m3m 4/m 3 2/m
03.CB.15 Simmonsite! Na2LiAlF6 P 21/n 2/m

Other Elpasolite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Elpasolite :
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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Dana No: Strunz No: 03.CB.15





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