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Named for the type locality at Zalesi in Moravia in the Czech Republic, where it occurs as a weathering product of chalcopyrite and cobalt arsenides. Additional localities include in the United States in Colorado in association with pharmacolite, in Brazil also in association with pharmacolite at Bumado, in Cornwall, England, Germany, Italy, Switzerland, France, as sprays of acicular crystals at the Dolores prospect in Spain, as crystalline aggregates at Laurion in Greece, and in Japan.  Zalesiite appears as pale green to green to blue acicular crystals, fibrous aggregates, or as coatings.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

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