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AHF

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Formula:
Al
 
16
(F,OH)
 
48
 · 12-15H
 
2
O
System:Isometric
Name:From the chemical components.


The Na- and Mg-free end-member, termed AHF, of the Ralstonite - aluminum hydroxide fluoride hydrate - AHF isostructural solid-solution series.

Pyrochlore structure.

Observed in many fumarolic deposits.

Classification of AHF

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Crystallography of AHF

Crystal System:Isometric

Chemical Properties of AHF

Formula:
Al
 
16
(F,OH)
 
48
 · 12-15H
 
2
O
All elements listed in formula:Al, F, H, O

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 AHF

Reference List:

- +
Carobbi, G. and Cipriani, C. (1951) Richerche su alcuni prodotti delle fumarole vesuviane. Rend. Soc. Ital. Mineral. Petrol.: 7: 43-44.

Naboko, S.I. (1957) A case of gaseous fluorine metasomatism at an active volcano. Geochemistry: 452-455.

Birnie, R.W. and Hall, J.H. (1974) The geochemistry of El Misiti volcano, Peru fumaroles. Bulletin of Volcanology: 38: 1-15.

Naughton, J.J., Greenberg, V.A., and Goguel, R. (1976) Incrustations and fumarolic condensates at Kilauea volcano, Hawaii: field, drill hole and laboratory observations. Journal Volcanol. Geotherm. Res.: 1: 149-165.

Desborough, G.A. and Rostad, O. (1980) Hydrated aluminum hydroxy-fluoride, a ralstonite-like mineral at Big Southern Butte, Snake River Plain, Idaho. American Mineralogist: 65: 1057-1058.

Rosenberg, P.E. (1988) Aluminum fluoride hydrates, volcanogenic salts from Mount Erebus, Antarctica. American Mineralogist: 73: 855-860.

Papike, J.J., Keith, T.E.C., Spilde, M.N., Galbreath, K.C., Shearer, C.K., and Laul, J.C. (1991) Geochemistry and mineralogy of fumarolic deposits, Valley of Ten Thousand Smokes, Alaska bulk chemical and mineralogical evlution of dacite-rich protolith. American Mineralogist: 76: 1662-1673.

Serafimova, E.K. (1997) Fluorides deposited during post-eruptive activities on Kamchatka volcanoes. Volcanol. Seismol.: 18: 571-614.

Africano, F. and Bernard, A. (2000) Acid alteration in the fumarolic environment of Usu volcano, Hokkaido, Japan. Journal of Volcanology and Geothermal Research: 97: 475-495.

Rosenberg, P.E. (2006) Stability relations of aluminum hydroxy-fluoride hydrate, a ralstonite-like mineral, in the system AlF3-Al2O3-H2O-HF. Canadian Mineralogist: 44: 125-134.

Internet Links for AHF

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    • Localities for AHF

    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.
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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.
    Antarctica
     
    • Eastern Antarctica
      • Victoria Land
        • Ross Island
    		Rosenberg, P.E. (1988) Aluminum fluoride hydrates, volcanogenic salts from Mount Erebus, Antarctica. American Mineralogist: 73: 855-860.
    Japan
     
    • Hokkaido
      • Iburi Province
    		Africano & Bernard (2000), Jour. Volcanology & Geothermal Research: 97: 475-495.
    USA
     
    • Alaska
      • Dillingham Borough
    		Keith, T.E.C. (1991) Fossil and activefumaroles in the 1912 eruptive deposits, Valley of Ten Thousand Smokes, Alaska. Journal Volcanol. Geotherm Res.: 45: 227-254.
    • Hawaii
      • Hawaii Co. (Hawaii Island)
    		Naughton, J.J., Greenberg, V.A., and Goguel, R. (1976) Incrustations and fumarolic condensates at Kilauea volcano, Hawaii: field, drill hole and laboratory observations. Journal Volcanol. Geotherm. Res.: 1: 149-165.
    • Idaho
      • Butte Co.
    		Desborough & Rostad (1980), American Mineralogist: 65: 1057-1058.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 16:03:27
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