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Elpasolite Mineral Data
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General Elpasolite Information
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 Chemical Formula: |
K2NaAlF6 |
| Composition: |
Molecular Weight = 242.16 gm |
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Potassium 32.29 % K 38.90 % K2O |
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Sodium 9.49 % Na 12.80 % Na2O |
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Aluminum 11.14 % Al 21.05 % Al2O3 |
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Fluorine 47.07 % F 47.07 % F |
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- %
F -19.82 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
K2NaAlF6 |
| IMA Status: |
Valid Species (Pre-IMA) 1883 |
| Locality: |
St Peters Dome, El Paso County, Colorado, USA Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality |
| Name Pronunciation: |
Elpasolite + Pronunciation  |
| Synonym: |
ICSD 6027 |
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PDF 22-1235 |
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Elpasolite Image |
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Images:
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Elpasolite
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 |
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Elpasolite Crystallography
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| Cell Dimensions: |
a = 8.122, Z = 4; V = 535.78 Den(Calc)= 3.00 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.868(1), 2.03(0.9), 2.345(0.75), |
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Physical Properties of Elpasolite
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| Cleavage: |
None |
| Color: |
Colorless. |
| Density: |
2.995 |
| Diaphaneity: |
Transparent |
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Vitreous - Greasy |
| Streak: |
white |
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Optical Properties of Elpasolite
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| Optical Data: |
Isotropic, n=1.376. |
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Calculated Properties of Elpasolite
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| Electron Density: |
Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Elpasolite =3.00 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0000387498
Boson Index = 0.9999612502 |
| Photoelectric: |
PEElpasolite = 4.02 barns/electron
U=PEElpasolite x relectron= 11.56 barns/cc.
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| Radioactivity: |
GRapi = 446.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Elpasolite per GRapi unit = 0.22 (%)
Estimated Radioactivity from Elpasolite  - barely detectable
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Elpasolite Classification
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| Dana Class: |
11.06.02.01 (11)Halide Complexes; Alumino-fluorides |
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(11.06)with miscellaneous formulae |
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(11.06.02)Dana Group |
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11.06.02.01 Elpasolite K2NaAlF6 F m3m 4/m 3 2/m |
| Strunz Class: |
03.CB.15 03 - HALIDES |
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03.C - Complex Halides |
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03.CB -Neso-aluminofluorides |
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03.CB.15 Cryolite Na3AlF6 P 21/n 2/m |
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03.CB.15 Elpasolite K2NaAlF6 F m3m 4/m 3 2/m |
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03.CB.15 Simmonsite! Na2LiAlF6 P 21/n 2/m |
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Other Elpasolite Information
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Elpasolite Specimen Label here :
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Elpasolite
K2NaAlF6
Dana No: 11.06.02.01 Strunz No: 03.CB.15
Locality:
Notes:
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