Rostite

rostite

tschermigite

alunogen

copiapite

Images

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

Coal-seam fires

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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