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Elpasolite

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Formula:
NaK2[AlF6]
System:
Isometric
Colour:
Colourless
Hardness:
Name:
For the type locality, El Paso County, Colorado, USA.
This page provides mineralogical data about Elpasolite.

Classification of Elpasolite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
3.CB.15

3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.2.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.7

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

Year of Discovery:
1883
Geological Setting of First Recorded Material:
Lining solution cavities in pachnolite in a cryolite-bearing pegmatite.
Associated Minerals at First Recorded Locality:

Physical Properties of Elpasolite

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

Crystallography of Elpasolite

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pa3
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:
NaK2[AlF6]
Essential elements:
All elements listed in formula:

Relationship of Elpasolite to other Species

3.CB.05CryolithioniteNa3Li3[AlF6]2
3.CB.15CryoliteNa3[AlF6]
3.CB.15SimmonsiteNa2Li[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
8.6.1ZharchikhiteAlF(OH)2
8.6.2ChloraluminiteAlCl3 · 6H2O
8.6.3CadwaladeriteAlCl(OH)2 · 4H2O
8.6.4CryolithioniteNa3Li3[AlF6]2
8.6.5CryoliteNa3[AlF6]
8.6.6ChioliteNa5Al3F14
8.6.8WeberiteNa2Mg[AlF6]F
8.6.9RalstoniteNaMg[Al(F,OH)6] · H2O
8.6.10KoeneniteNa4Mg9Al4Cl12(OH)22
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O x about 1.75
8.6.12GearksutiteCa[Al(F,OH)5(H2O)]
8.6.13ProsopiteCaAl2(F,OH)8
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2O
8.6.15CarlhintzeiteCa2[AlF6]F · H2O
8.6.16ColquiriiteCaLi[AlF6]
8.6.17ThomsenoliteNaCa[AlF6] · H2O
8.6.18PachnoliteNaCa[AlF6] · H2O
8.6.19Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)

Other Names for Elpasolite

Name in Other Languages:

Other Information

May fluoresce in SW medium blue with a violet tinge
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 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

Localities for Elpasolite

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.
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]; Richards, R. P., Kearns, L. E., & Cook, W. R. (1998). Morphology of Chiolite twins from the Morefield mine, Amelia County, Virginia. Canadian mineralogist, 36, 1009-1016.
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