Alunogen
| Alunogen | |
|---|---|
 Alunogen |
|
| General | |
| Category | Sulfate minerals |
| Chemical formula | Al2(SO4)3·17H2O |
| Strunz classification | 07.CB.45 |
Alunogen also called feather alum and hair salt is a colourless to white (although often coloured by impurities, like iron substituting for aluminum) fibrous to needle-like aluminium sulfate mineral often found on the walls of mines and quarries as secondary mineral. It can be found in the oxidation zones of some ore deposits as well as on burning coal dumps (i.e. as the product of millosevichite hydratation).
Alunogen has the chemical formula Al2(SO4)3·17H2O. More precise, crystallochemical formula, can be written as: [Al(H2O)6]2(SO4)3.5H2O. The second formula shows that H2O in the alunogen formula occurs both as ligand (coordinative form) and loosely-bounded (crystallization) form. The second form can be easily removed just by slight grinding of the mineral (by preserving the unique structure).
[edit] References
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