Mineralpedia Details for 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)6ยท3H2O
- Crystal System
- Hexagonal
- Crystal Habit
- Fibrous, Acicular, Powdery
- Luster
- Vitreous - Resinous
- Color
- pale green
- Streak
- white
- Class
- Hexagonal - Dipyramidal
- Hardness
- 2-3
- WebMineral
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- Mindat
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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.
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.
