A piece of magnetite-chalcopyrite ore from the Zlaty Kopec skarn deposit in the Krusne Hory Mountains, Czech Republic, containing disseminated, fine-grained schoenfliesite and wickmanite. Both minerals are members of the Schoenfliesite Group: schoenfliesite is a magnesium tin hydroxide and wickmanite a manganese tin hydroxide. Ex. Paulo Matioli collection.
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