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azurite

basic copper carbonate [Cu3(OH)2(CO3)2]. It is ordinarily found with malachite in the oxidized zone of copper lodes. Notable deposits are Tsumeb, Namibia; Chessy, Fr.; and Bisbee, Ariz., U.S. Azurite was used as a blue pigment in ancient Eastern wall painting and, from the 15th to the middle of the 17th century, in European painting. For detailed physical properties, see carbonate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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