Tags: Chemical Substance, Mineral.
Alunogen also called feather alum and hair salt is a colourless to white (although often coloured by impurities such as iron substituting for aluminium) fibrous to needle-like aluminium sulfate mineral. It has the chemical formula Al2(SO4)3·17H2O.It is often found on the walls of mines and quarries as a 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 hydration).
