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Alunite Supergroup

Big Photo

Le Mazega, Saint-Rome-de-Tarn, Millau, Aveyron, Midi-Pyrénées, France
© P.Queneau

Show Alunite Supergroup Photos (9)
Formula:
A
1+
 
B
3
3
(SO
 
4
)
 
2
(OH)
 
6


Also known as Alunite Family (includes Crandallite Subgroup, Beudantite Subgroup, Florencite Subgroup, Alunite Subgroup and Jarosite Subgroup).
Various other names have been used for these subgroups.

In the general formula, A = Na, K, Pb, Rb, NH4, Ag, or H2O, and B = Al, Fe3+, V3+ or Ga3+. Crystals in the group are generally small, imperfect, and rare. Habit is usually either tabular {0001} or pseudo-cubic (cube-like rhombohedron) to pseudo-cuboctahedral.

Classification of Alunite Supergroup

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Chemical Properties of Alunite Supergroup

Formula:
A
1+
 
B
3
3
(SO
 
4
)
 
2
(OH)
 
6

Relationship of Alunite Supergroup to other Species

Minerals in Group:
Alunite:
KAl
 
3
[(OH)
 
3
|SO
 
4
]
 
2
Beudantite:
PbFe
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
Crandallite:
CaAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
Jarosite:
KFe
3+
 
 
3
[(OH)
 
3
|SO
 
4
]
 
2

Other Names for Alunite Supergroup

Synonyms:
Alunite Family
Other Languages:

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 Alunite Supergroup

Reference List:Hendricks (1937) American Mineralogist: 22: 773.

Lemmon (1937) American Mineralogist: 22: 939.

McConnell (1942) American Journal of Science: 240: 649.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 555-556.

Internet Links for Alunite Supergroup

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    Localities for Alunite Supergroup

    (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.
    France
     
    • Midi-Pyrénées
      • Aveyron
        • Millau
          • Saint-Rome-de-Tarn
    		Patrice Queneau Collection
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. 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. 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 Nov 2009 19:26:30