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Simmonsite

Formula:
Na
 
2
Li[AlF
 
6
]
System:MonoclinicColour:Cream, pale buff
Lustre:GreasyHardness:2½ - 3
Name: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, especially those of Colorado and of NYF type.
This page provides mineralogical data about Simmonsite.

Classification of Simmonsite

IMA status:Approved
Strunz 8th edition ID:3/B.03-25
Nickel-Strunz 10th (pending) edition ID:3.CB.15

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

Type Locality:Zapot pegmatite, Gillis Range, Fitting District, Mineral Co., Nevada, USA

Physical Properties of Simmonsite

Lustre:Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Cream, pale buff
Streak:White
Hardness (Mohs):2½ - 3

Crystallography of Simmonsite

Crystal System:Monoclinic

Optical Data of Simmonsite

Type:Biaxial
RI values: nα = 1.359 nβ = 1.359 nγ = 1.359
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v weak

Chemical Properties of Simmonsite

Formula:
Na
 
2
Li[AlF
 
6
]
Essential elements:Al, F, Li, Na
All elements listed in formula:Al, F, Li, Na

Relationship of Simmonsite to other Species

Related Minerals - Nickel-Strunz Grouping):
3.CB.05Cryolithionite
Na
 
3
Li
 
3
[AlF
 
6
]
 
2
3.CB.15Cryolite
Na
 
3
[AlF
 
6
]
3.CB.15Elpasolite
NaK
 
2
[AlF
 
6
]
3.CB.20Colquiriite
CaLi[AlF
 
6
]
3.CB.25Weberite
Na
 
2
Mg[F|AlF
 
6
]
3.CB.30Karasugite
SrCa[Al(F,OH)
 
7
]
3.CB.35Usovite
Ba
 
2
CaMgAl
 
2
F
 
14
3.CB.40Pachnolite
NaCaAlF
 
6
·H
 
2
O
3.CB.40Thomsenolite
NaCaAlF
 
6
·H
 
2
O
3.CB.45Carlhintzeite
Ca
 
2
[F|AlF
 
6
] · H
 
2
O
3.CB.50Yaroslavite
Ca
 
3
Al
 
2
F
 
10
(OH)
 
2
·H
 
2
O

Other Names for Simmonsite

Synonyms:
IMA1997-045
German names:
Simmonsit
Russian names:
Симмонсит
Spanish names:
Simmonsita

Other Information

Health Warning: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:American Mineralogist (1999): 84: 769-772.

Articles/Blogs about Simmonsite

Internet Links for Simmonsite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Simmonsite in the Natural History Museum (London) online catalogue
  • Simmonsite details from Handbook of Mineralogy (PDF)
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    Localities for Simmonsite

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    (TL) indicates type locality. ? 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.
    USA
     
    • Nevada
      • Mineral Co.
        • Fitting District
          • Gillis Range
    		Mineralogical Record: 31: 204.
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