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Formula: Al(SO4)(OH).5H2O
Hydrated sulphate, paramorph of
jurbanite, questionable mineral species
Crystal System: Orthorhombic
Specific gravity: 1.892 measured, 1.92 to 1.96 calculated
Colour: Chalky white
Environments
Localities
At the type locality, the Kladno mine, Libušin, Kladno District, Central Bohemian Region, Czech Republic,
rostite occurs in burning waste heaps at a coal mine, formed by decomposition of
aluminum-bearing rocks by gasses containing SO2 and fluorine.
Associated minerals include tschermigite,
alunogen and copiapite
(HOM).
Rostite from the Kladno Mine - Image
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