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Elpasolite

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Formula:
NaK
 
2
[AlF
 
6
]
System:IsometricColour:Colourless
Hardness:
Name:For the type locality, El Paso County, Colorado, USA.
This page provides mineralogical data about Elpasolite.

Classification of Elpasolite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/B.03-40
Nickel-Strunz 10th (pending) edition ID:3.CB.15

3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
Dana 8th edition ID:11.6.2.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
Hey's CIM Ref.:8.6.7

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
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Type Occurrence of Elpasolite

Type Locality:St Peters Dome, Cheyenne District (St. Peters Dome District), El Paso Co., Colorado, USA
Year of Discovery:1883
Geological Setting of type material:Lining solution cavities in pachnolite in a cryolite-bearing pegmatite.
Associated Minerals at type locality:
Pachnolite

Physical Properties of Elpasolite

Lustre:Sub-Vitreous, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless
Streak:White
Hardness (Mohs):
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (measured):2.995 g/cm3
Density (calculated):3.015 g/cm3

Crystallography of Elpasolite

Crystal System:Isometric
Class (H-M):m3 (2/m 3) - Diploidal
Space Group:Pa3 {P21/a 3}
Cell Parameters:a = 8.12Å
Unit Cell Volume:V 535.39 ų (Calculated from Unit Cell)
Morphology:Indistinct crystals at times with indistinct octahedral and cubic faces. Massive. Artificial crystals are cubo-octahedral.

Chemical Properties of Elpasolite

Formula:
NaK
 
2
[AlF
 
6
]
Simplified for copy/paste:NaK2[AlF6]
Essential elements:Al, F, K, Na
All elements listed in formula:Al, F, K, Na

Relationship of Elpasolite 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.15Simmonsite
Na
 
2
Li[AlF
 
6
]
3.CB.20Colquiriite
CaLi[AlF
 
6
]
3.CB.25Weberite
Na
 
2
Mg[AlF
 
6
]F
3.CB.30Karasugite
SrCa[Al(F,OH)
 
7
]
3.CB.35Usovite
Ba
 
2
CaMgAl
 
2
F
 
14
3.CB.40Pachnolite
NaCa[AlF
 
6
] · H
 
2
O
3.CB.40Thomsenolite
NaCa[AlF
 
6
] · H
 
2
O
3.CB.45Carlhintzeite
Ca
 
2
[AlF
 
6
]F · H
 
2
O
3.CB.50Yaroslavite
Ca
 
3
Al
 
2
F
 
10
(OH)
 
2
· H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
8.6.1Zharchikhite
AlF(OH)
 
2
8.6.2Chloraluminite
AlCl
 
3
· 6H
 
2
O
8.6.3Cadwaladerite
AlCl(OH)
 
2
· 4H
 
2
O
8.6.4Cryolithionite
Na
 
3
Li
 
3
[AlF
 
6
]
 
2
8.6.5Cryolite
Na
 
3
[AlF
 
6
]
8.6.6Chiolite
Na
 
5
Al
 
3
F
 
14
8.6.8Weberite
Na
 
2
Mg[AlF
 
6
]F
8.6.9Ralstonite
NaMg[Al(F,OH)
 
6
] · H
 
2
O
8.6.10Koenenite
Na
 
4
Mg
 
9
Al
 
4
Cl
 
12
(OH)
 
22
8.6.11 Chlor-manasseite
Mg
 
x
Al(OH)
 
2x+2
Cl · (x-0.8)H
 
2
O x about 1.75
8.6.12Gearksutite
Ca[Al(F,OH)
 
5
(H
 
2
O)]
8.6.13Prosopite
CaAl
 
2
(F,OH)
 
8
8.6.14Yaroslavite
Ca
 
3
Al
 
2
F
 
10
(OH)
 
2
· H
 
2
O
8.6.15Carlhintzeite
Ca
 
2
[AlF
 
6
]F · H
 
2
O
8.6.16Colquiriite
CaLi[AlF
 
6
]
8.6.17Thomsenolite
NaCa[AlF
 
6
] · H
 
2
O
8.6.18Pachnolite
NaCa[AlF
 
6
] · H
 
2
O
8.6.19Zirklerite
(Fe,Mg,Ca)
 
9
Al
 
4
Cl
 
18
(OH)
 
12
· 14H
 
2
O (?)

Other Names for Elpasolite

Other Languages:
German:Elpasolit
Russian:Эльпасолит
Spanish:Elpasolita

Other Information

Fluorescence in UV light:May fluoresce in SW medium blue with a violet tinge
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 Elpasolite

Reference List:

- +
Cross and Hillebrand (1883) American Journal of Science: 26: 283.

Cross and Hillebrand (1885) USGS Bulletin 20: 57.

Menzer (1932) Forschritte der Mineralogie, Kristallographie und Petrographie, Jena: 17: 61.

Frondel, C. (1948) American Mineralogist: 33: 84-87.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 114.

Neues Jahrbuch für Mineralogie, Monatshefte (1987): 481-487.

Pekov, I.V., Chukanov, N.V., Kononkova, N.N., Zubkova, N.V., Rabadanov, M.K., and Pushcharovsky, D.Y. (2007): Elpasolite from Hyperagpaitic Pegmatite of Khibiny Massif, Kola Peninsula. On the Elpasolite Symmetry. Zapiski RMO, v.6, pp. 76-84 (in Rus.).

Internet Links for Elpasolite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Elpasolite details from Handbook of Mineralogy (PDF)
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  • Localities for Elpasolite

    The 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. ? 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.
    Democratic Republic of Congo (Zaïre)
     
    • Kivu
      • Goma
    Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980
    Greenland
     
    • Sermersooq
      • Arsuk Fjord
        • Ivittuut (Ivigtut)
    [Petersen and Secher, 1993 - "The Minerals of Greenland", MinRec 24:1-88]; Petersen, O. V and K Secher (1993) The Minerals of Greenland. Mineralogical Record 24:36
    Italy
     
    • Tuscany
      • Siena Province
        • Chiusdino
    Sabelli C.,(1987 )"Structure refinement of Elpasolite from the Cetine mine, Tuscany, Italy - N. Jb. Miner. Mh and Brizzi G., Ciselli I, Santucci A. (1988) - Cetineite ed altre novità dalle Cetine di Cotorniano - Riv. Miner. Ital., Milano, fasc. 3, pp.73-82
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Chitinskaya Oblast'
    Victor V. Sharygin analytycal data (2013)
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
            • Koashva Mt
    Pekov, I.V., Chukanov, N.V., Kononkova, N.N., Zubkova, N.V., Rabadanov, M.K., and Pushcharovsky, D.Y. (2008): Geology of Ore Deposits 50(8), 749-754.
          • Lovozero Massif
    Pekov, I.V., Chukanov, N.V., Kononkova, N.N., Zubkova, N.V., Rabadanov, M.K., and Pushcharovsky, D.Y. (2008): Geology of Ore Deposits 50(8), 749-754.
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Ilmen Mts
            • Ilmen Natural Reserve
    Polyakov, V.O. (1985): Alumofluorites of the Il’meny Mountains. In: Minerals from Deposits of the Central and Southern Urals (Sverdlovsk), 3-11.
    Ukraine
     
    • Zhytomyr Oblast' (Zhitomir Oblast')
    Yurk Yu.Yu., Gurov E.P., Gurova E.P. (1973) Pecularities of fluorin mineralogy of Ukrainian crystalline shield, - Naukova Dumka, Kiev, pp.184 (in Russian).; Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    Kalyuzhnyi V.A. (1958) Mineralogicheskii Sbornik L'vovskogo Geologicheskogo Obschestva, N12.; Lyckberg, P., Chornousenko, V. & Wilson, W. E. (2009): Volodarsk-Volynski, Zhitomir Oblast, Ukraine. Mineralogical Record, 40, 473-506.; Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    USA
     
    • Colorado
      • El Paso Co.
        • Cheyenne District (St. Peters Dome District)
    Cross and Hillebrand (1883) - "On minerals of the cryolite group recently found in Colorado"; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 114.
    Am Min 51:299-323
      • Fremont Co.
    "Minerals of Colorado, updated & revised", p. 16, by Eckel, Edwin B., 1997
    • Nevada
      • Mineral Co.
        • Fitting District
          • Gillis Range
    Mineralogical Record: 30: 277-292.
    • Virginia
      • Amelia Co.
        • Winterham
    [Kearns, 1995 "Alumino-Fluorides from the Morefield Pegmatite", MinRec 26:551-556]
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