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Alum Group

Formula:
XAl(SO
 
4
)
 
2
·12H
 
2
O


A generic term for hydrated sulphates of aluminium (or other trivalent cations) and an alkali (or comparable monovalent cation).
A large number of synthetic analogues is known.
Alums crystallize in one of three different crystal structures. These classes are called α-, β- and γ-alums.

Classification of Alum Group

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Chemical Properties of Alum Group

Formula:
XAl(SO
 
4
)
 
2
·12H
 
2
O

Relationship of Alum Group to other Species

Minerals in Group:
Alum-(K):
KAl[SO
 
4
]
 
2
 · 12H
 
2
O
Alum-(Na):
NaAl[SO
 
4
]
 
2
 · 12H
 
2
O

Other Names for Alum Group

Synonyms:
Alun
Other Languages:
German:Alaun

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 Alum Group

Reference List: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.: 471-472.

Internet Links for Alum Group

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    Localities for Alum Group

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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: 17th Nov 2009 17:32:29