Mineralogy Database

Simmonsite Mineral Data

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General Simmonsite Information

Help on Chemical  Formula: Chemical Formula: Na2LiAlF6
Help on Composition: Composition: Molecular Weight = 193.89 gm
   Sodium    23.71 %  Na   31.97 % Na2O
   Lithium    3.58 %  Li    7.71 % Li2O
   Aluminum  13.92 %  Al   26.29 % Al2O3
   Fluorine  58.79 %  F    58.79 % F
               -   %   F   -24.76 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2LiAlF6
Help on Environment: Environment: Found in a late-stage breccia pipe that cuts the Zapot amazonitic microcline - topaz - zinnwaldite granitic pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Gillis Range, Mineral County, Nevada, U.S.A. Link to MinDat.org Location Data.
Help on Name Origin: 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
Help on Name Pronunciation: Name Pronunciation: Simmonsite + Pronunciation Say SIMMONSITE
Help on Synonym: Synonym: IMA1997-045

Simmonsite Image

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Comments: Backscattered electron images of primary assemblage of cryolite-cryolithionite (cl) simmonsite (sm) and trace elpasolite (ep). (AmMin, v 84, p 770).
Location: Zapot amazonite-topaz-zinnwaldite pegmatite located in the Gillis Range, Mineral Co., Nevada, USA. Scale: See Image.
© American Mineralogist

Simmonsite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.984:1:1.3978
Help on Cell Dimensions: Cell Dimensions: a = 5.2842, b = 5.3698, c = 7.5063, Z = 2; beta = 89.98° V = 212.99 Den(Calc)= 3.02
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.33(1), 1.877(0.9), 2.25(0.7),

Physical Properties of Simmonsite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale buff cream.
Help on Density: Density: 3.05
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white

Optical Properties of Simmonsite

Help on Optical Data: Optical Data: Biaxial (?), a=1.359, b=1.359, g=1.359, bire=0.0000

Calculated Properties of Simmonsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Simmonsite =3.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0026848641
Boson Index = 0.9973151359
Help on Photoelectric: Photoelectric: PESimmonsite = 1.10 barns/electron
U=PESimmonsite x rElectron Density= 3.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Simmonsite is Not Radioactive

Simmonsite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.06)with miscellaneous formulae
  (11.06.01)Cryolite Group Cryolite Na3AlF6 P 21/n 2/m Simmonsite! Na2LiAlF6 P 21/n 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 Simmonsite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(MinRec, V 31, No. 2, AmMin, v 89, p 252) OPTIC PROP.(Eur. J. Min.,Vol.10,1998)
Help on See Also: See Also: Links to other databases for Simmonsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 03.CB.15





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