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Elpasolite

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About ElpasoliteHide

Formula:
K2NaAlF6
Colour:
Colourless
Lustre:
Sub-Vitreous, Greasy
Hardness:
Specific Gravity:
2.995
Crystal System:
Isometric
Name:
First described and named by Cross and Hillebrand (1883,1885) from quartz riebeckite microcline pegmatites at St.Peter’s Dome, El Paso County, Colorado, USA. Named for the type locality (El Paso County).
This page provides mineralogical data about Elpasolite.


Classification of ElpasoliteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1883
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

Physical Properties of ElpasoliteHide

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

Chemical Properties of ElpasoliteHide

Formula:
K2NaAlF6

Crystallography of ElpasoliteHide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pa3
Cell Parameters:
a = 8.12 Å
Unit Cell 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.

Type Occurrence of ElpasoliteHide

Geological Setting of Type Material:
Lining solution cavities in pachnolite in a cryolite-bearing pegmatite.
Associated Minerals at Type Locality:

Other Language Names for ElpasoliteHide

Relationship of Elpasolite to other SpeciesHide

Other Members of this group:
CryoliteNa2NaAlF6Mon. 2/m
SimmonsiteNa2LiAlF6Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Elpasolite associated with SulphurS8
3 photos of Elpasolite associated with GypsumCaSO4 · 2H2O
2 photos of Elpasolite associated with AmazoniteK(AlSi3O8)
2 photos of Elpasolite associated with FluoriteCaF2
2 photos of Elpasolite associated with CryoliteNa2NaAlF6
2 photos of Elpasolite associated with WeberiteNa2Mg[AlF6]F
2 photos of Elpasolite associated with GearksutiteCa[Al(F,OH)5(H2O)]
1 photo of Elpasolite associated with ChioliteNa5Al3F14
1 photo of Elpasolite associated with ProsopiteCaAl2F4[(OH)4-xFx], x = 0.0–1.0

Related Minerals - Nickel-Strunz GroupingHide

3.CB.05CryolithioniteNa3Li3[AlF6]2Iso. m3m (4/m 3 2/m) : Ia3d
3.CB.15CryoliteNa2NaAlF6Mon. 2/m
3.CB.15SimmonsiteNa2LiAlF6Mon.
3.CB.20ColquiriiteCaLi[AlF6]Trig.
3.CB.25WeberiteNa2Mg[AlF6]FOrth. mmm (2/m 2/m 2/m) : Immm
3.CB.30KarasugiteSrCa[Al(F,OH)7]Mon.
3.CB.35UsoviteBa2CaMgAl2F14Mon.
3.CB.40PachnoliteNaCa[AlF6] · H2OMon. 2/m
3.CB.40ThomsenoliteNaCa[AlF6] · H2OMon. 2/m : P21/b
3.CB.45CarlhintzeiteCa2[AlF6]F · H2OTric.
3.CB.50YaroslaviteCa3Al2F10(OH)2 · H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.6.1ZharchikhiteAlF(OH)2Mon.
8.6.2ChloraluminiteAlCl3 · 6H2OTrig.
8.6.3CadwaladeriteAl5(H2O)3(OH)12·n(Cl,H2O)Amor.
8.6.4CryolithioniteNa3Li3[AlF6]2Iso. m3m (4/m 3 2/m) : Ia3d
8.6.5CryoliteNa2NaAlF6Mon. 2/m
8.6.6ChioliteNa5Al3F14Tet. 4/mmm (4/m 2/m 2/m) : P4/mnc
8.6.8WeberiteNa2Mg[AlF6]FOrth. mmm (2/m 2/m 2/m) : Immm
8.6.9Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O Iso. m3m (4/m 3 2/m) : Fd3m
8.6.10KoeneniteNa4Mg9Al4Cl12(OH)22Trig. 3m (3 2/m) : R3m
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O
x about 1.75
8.6.12GearksutiteCa[Al(F,OH)5(H2O)]Tric. 1 : P1
8.6.13ProsopiteCaAl2F4[(OH)4-xFx], x = 0.0–1.0Mon. 2/m : B2/b
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2OOrth.
8.6.15CarlhintzeiteCa2[AlF6]F · H2OTric.
8.6.16ColquiriiteCaLi[AlF6]Trig.
8.6.17ThomsenoliteNaCa[AlF6] · H2OMon. 2/m : P21/b
8.6.18PachnoliteNaCa[AlF6] · H2OMon. 2/m
8.6.19Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)Trig.

Fluorescence of ElpasoliteHide

May fluoresce in SW medium blue with a violet tinge

Other InformationHide

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 ElpasoliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cross and Hillebrand (1883) American Journal of Science: 26: 283.
Cross, E.B., Hillebrand, W.F. (1885) Minerals from the neighbourhood of Pikes Peak. U.S. Geological Survey Bulletin: 20: 40-68.
Menzer (1932) Forschritte der Mineralogie, Kristallographie und Petrographie, Jena: 17: 61.
Frondel, C. (1948) New data on elpasolite and hagemannite. 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., Pushcharovsky, D.Y. (2007) Elpasolite from Hyperagpaitic Pegmatite of Khibiny Massif, Kola Peninsula. On the Elpasolite Symmetry. Zapiski RMO: 6: 76-84. (in Russian)

Internet Links for ElpasoliteHide

Localities for ElpasoliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Victoria Land
      • Ross Archipelago
        • Ross Island
Kammerer, M. M. (2011). Nature and origin of salt deposits around the crater of Erebus volcano, Antarctica (Master dissertation, New Mexico Institute of Mining and Technology).
Denmark
 
  • Greenland
    • Sermersooq
      • Arsuk Fjord
        • Ivittuut (Ivigtut)
Petersen, O.V. and Secher, K. (1993): The minerals of Greenland. Mineralogical Record 24 (2): 1-65 (p.36)
DR Congo
 
  • North Kivu
    • Nyiragongo Territory
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
Italy
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
Balassone, G.; Petti, C.; Mondillo, N.; Panikorovskii, T.L.; de Gennaro, R.; Cappelletti, P.; Altomare, A.; Corriero, N.; Cangiano, M.; D’Orazio, L. (2019) Copper Minerals at Vesuvius Volcano (Southern Italy): A Mineralogical Review. Minerals 9, 730.
  • 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; Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p.
Russia
 
  • Chelyabinsk Oblast
    • Ilmen Mountains
Galina Gubko, Natalia Levtsova (2009) Blyum Pit in the Ilmeny Mountains. Fifth International Symposium Mineral Diversity Research and Preservation pp59-64
Polyakov, V.O. (1985): Alumofluorites of the Il’meny Mountains. In: Minerals from Deposits of the Central and Southern Urals (Sverdlovsk), 3-11.
  • Murmansk Oblast
    • 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.
    • Lovozersky District
Pakhomovsky, Y. A., Ivanyuk, G. Y., & Yakovenchuk, V. N. (2014). Loparite-(Ce) in rocks of the Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 56(8), 685-698.
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.
  • Zabaykalsky Krai
    • Chitinskaya Oblast
Victor V. Sharygin analytycal data (2013); Sharygin, V. V., & Vladykin, N. V. (2014). Mineralogy of cryolite rocks from the Katugin massif, Transbaikalia, Russia. Abstract Book of 30th International Conference on “Ore Potential of Alkaline, Kimberlite and Carbonatite Magmatism,” Antalya, Turkey, 166-168.; E. V. Sklyarov, D. P. Gladkochub, A. B. Kotov, A. E. Starikova, V. V. Sharygin, S. D. Velikoslavinsky, A. M. Larin, A. M. Mazukabzov, E. V. Tolmacheva, E. A. Khromova (2016): Genesis of the Katugin rare-metal ore deposit: Magmatism versus metasomatism. Russian Journal of Pacific Geology 10, 155–167.
Ukraine
 
  • Zhytomyr Oblast
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.
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.
USA (TL)
 
  • Colorado
    • El Paso Co.
      • Cheyenne Mining District (St. Peters Dome Mining 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 Mining District
        • Gillis Range
Mineralogical Record: 30: 277-292.
  • Texas
    • Hudspeth Co.
      • Sierra Blanca Peaks
O'Neill, L. C. (2014). REE-Be-UF mineralization of the Round Top laccolith, Sierra Blanca Peaks, Trans-Pecos Texas (MS dissertation).
  • 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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