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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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