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Simmonsite

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Formula:
Na2Li[AlF6]
System:
Monoclinic
Colour:
Cloudy white, Cream ...
Lustre:
Waxy, Greasy
Hardness:
2½ - 3
Name:
Named in 1999 by Eugene Edward Foord, Joseph T. O'Connor, John M. Hughes, Stephen J. Sutley, Alexander U. Falster, Arthur E. Soregaroli, Frederick E. Lichte, and Daniel E. Kile in honor of William B. "Skip" Simmons [b. November 5, 1943], University of New Orleans, New Orleans, Louisiana, U.S.A., specialist in the mineralogy and petrology of granitic pegmatites, especially those of Colorado and of NYF type.
Found as lumps (to > 2 cm) of cloudy white interlocking grains which may or may not have a distinct graular appearance. Simmonsite may be distinguished from the many other aluminofluorides with which it may be associated by its orange fluorescence in SW UV only. Cryolithionite fluoresces white to pale creamy white in SW and LW UV and briefly phosphoresces. Commonly associated and/or intergrown with cryolite and minor elpasoite.

Classification of Simmonsite

Approved 1999
3.CB.15

3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
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First Recorded Occurrence of Simmonsite

General Appearance of First Recorded Material:
Low luster waxy masses
Year of Discovery:
1992
Geological Setting of First Recorded Material:
Aluminofluoride pods (to 20 cm) in amazonite-rich granite pegmatite

Physical Properties of Simmonsite

Waxy, Greasy
Diaphaneity (Transparency):
Translucent
Comment:
Low luster waxy or low luster greasy
Colour:
Cloudy white, Cream white, pale buff
Streak:
White
Hardness (Mohs):
2½ - 3
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.05 g/cm3 (Measured)    3.06 g/cm3 (Calculated)

Crystallography of Simmonsite

Crystal System:
Monoclinic
Cell Parameters:
a = 7.5006Å, b = 7.474Å, c = 7.503Å
β = 90.848°
Ratio:
a:b:c = 1.004 : 1 : 1.004
Unit Cell Volume:
V 420.57 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals not observed
Twinning:
Abundant polysynthetic twinning
Comment:
P21 or P21/m
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.33 (100)
3.78 (10)
3.36 (5)
2.65 (60)
2.37 (15)
2.25 (70)
2.18 (50)
2.158 (40)
2.076 (5)
2.008 (10)
1.877 (90)
1.526 (25)

Optical Data of Simmonsite

Type:
Biaxial
RI values:
nα = 1.359 nβ = 1.359 nγ = 1.359
Birefringence:
0.0009
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak
Optical Extinction:
Nearly isotropic
Pleochroism:
Non-pleochroic

Chemical Properties of Simmonsite

Formula:
Na2Li[AlF6]
Essential elements:
All elements listed in formula:

Relationship of Simmonsite to other Species

3.CB.05CryolithioniteNa3Li3[AlF6]2
3.CB.15CryoliteNa3[AlF6]
3.CB.15ElpasoliteNaK2[AlF6]
3.CB.20ColquiriiteCaLi[AlF6]
3.CB.25WeberiteNa2Mg[AlF6]F
3.CB.30KarasugiteSrCa[Al(F,OH)7]
3.CB.35UsoviteBa2CaMgAl2F14
3.CB.40PachnoliteNaCa[AlF6] · H2O
3.CB.40ThomsenoliteNaCa[AlF6] · H2O
3.CB.45CarlhintzeiteCa2[AlF6]F · H2O
3.CB.50YaroslaviteCa3Al2F10(OH)2 · H2O

Other Names for Simmonsite

Name in Other Languages:

Other Information

Fluoresces moderately bright orange in Short Wave UV, but the fluorescent response may be patchy due to alterations. May be associated with cryolithionite which fluoresces white to pale creamy white in both Short Wave and Long Wave.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Simmonsite

Reference List:
Eugene Edward Foord, Joseph T. O'Connor, John M. Hughes, Stephen J. Sutley, Alexander U. Falster, Arthur E. Soregaroli, Frederick E. Lichte, and Daniel E. Kile (1999) Simmonsite, Na2LiAlF6, a New Mineral from the Zapot amazonite-topaz-zinnwaldite pegmatite, Hawthorne, Nevada, U.S.A., American Mineralogist 84: 769-772.

Internet Links for Simmonsite

Localities for Simmonsite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Chitinskaya Oblast'
Victor Sharygin's analytical data (2013);
USA
 
  • Nevada
    • Mineral Co.
      • Fitting District
        • Gillis Range
Mineralogical Record: 31: 204.
Mineral and/or Locality  
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