General Information
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 Chemical Formula: |
Na2LiAlF6 |
| Composition: |
Molecular Weight = 193.89 gm) |
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| Empirical Formula: |
Na2LiAlF6 |
| Environment: |
Found in a late-stage breccia pipe that cuts the Zapot amazonitic microcline - topaz - zinnwaldite granitic pegmatite. |
| IMA Status: |
Approved IMA 1998 (Dana # Added) |
| Locality: |
Gillis Range, Mineral County, Nevada, U.S.A. |
| Name Origin: |
Named after William B. "Skip" Simmons (b. 1943), University of New Orleans, New Orleans, Louisiana, U.S.A., specialist in the mineralogy and petrology of granitic pegmatites, especi ally those of Colorado and of NYF type |
| Synonym: |
IMA97.045 |
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Classification
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| Dana Class: |
11.6.1.2 (11)Halide Complexes; Alumino-fluorides |
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(11.6)with miscellaneous formulae |
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(11.6.1)Dana Group |
| Strunz Class: |
III/X.00-00 III - Halogenides |
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III/X - Unclassified Strunz Halogenides |
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III/X.00 - Fluoride, Anhydrous |
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Crystallography
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| Axial Ratios: |
a:b:c =1.0035:1:1.0038 |
| Cell Dimensions: |
a = 7.5006, b = 7.474, c = 7.503, Z = 4; beta = 90.847ø V = 420.57 Den(Calc)= 3.06 |
| Crystal System: |
Monoclinic Space Group: P21 or P21/m |
| X Ray Diffraction: |
By Intensity(I/Io): 4.33(1) 1.877(0.9) 2.25(0.7) |
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Physical Properties
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| Cleavage: |
None |
| Color: |
pale buff cream. |
| Density: |
3.05 |
| Diaphaniety: |
Transparent to translucent |
| Habits: |
Microscopic Crystals - Crystals visible only with microscopes., Inclusions - Generally found as inclusions in other minerals., |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luster: |
Greasy (Oily) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (?), a=1.359, b=1.359, g=1.359, bire=0.0000 |
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Other Information
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| References: |
NAME( CanMin, 8/99) PHYS. PROP.(MinRec, V 31, No. 2) OPTIC PROP.(Eur. J. Min.,Vol.10,1998) |
| See Also: |
Links to other databases for Simmonsite :
1 -MinDat.org Location Data
2 -MinMax
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