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Thermal dehydration of a natural hydrous ferric sulfate Fe(SO4)(OH)?2H2O was studied using x-ray-phase and thermal analyses. This mineral was found in the hypergenesis zone of the Khangalas gold deposit, Eastern Yakutia, Russia. A comparative analysis of the sample with known hypergenic hydrous ferric sulfates with a similar Fe2O3:SO3 ratio close to 1:1 was performed. The dissimilarities between the founded mineral and its possible polymorphs ? butlerite and parabutlerite are identified. The mineral is less stable...