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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)
Named after Dr. Josef Zemann, a crystallographer and specialist in tellurium minerals and a Professor of Mineralogy at the Univeristy of Vienna in Vienna, Austria. Found in four localities worldwide according to mindat.org, the Moctezuma mine in Mexico boasts as this mineral’s type locality. This rare mineral is found at Moctezuma as a “secondary mineral in the oxidized zone of a hydrothermal Au-Te deposit.”
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/zemannite.pdf