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Mineralpedia Details for Zalesiite

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Zalesiite

Zalesiite

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)

Formula
CaCu6(AsO4)2(AsO3OH)(OH)6ยท3H2
Crystal System
Hexagonal 
Crystal Habit
Fibrous, Acicular, Powdery 
Luster
Vitreous - Resinous 
Color
pale green 
Streak
white 
Class
Hexagonal - Dipyramidal 
Hardness
2-3 
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Zalesiite from Tucumana mine, Inca de Oro, Chanral Prov., Atacama, Chile

Zalesiite
            from Tucumana mine, Inca de Oro, Chanral Prov., Atacama, Chile

Light green acicular crystals less than 0.5mm in fibrous mats coveraing an area 2.5 x 1cm.

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Zalesiite from Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States

Zalesiite
            from Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States
Special Info
EDS Confirmed

Bright green fibrous sprays to 1mm on Quartz coated with Chrysocolla(?). This is the first reported occurence of this rare arsenate in South Dakota.

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