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[at-uh-kam-ahyt, uh-tak-uh-mahyt] /ˌæt əˈkæm aɪt, əˈtæk əˌmaɪt/
a mineral, hydrated chloride of copper, Cu 2 Cl(OH) 3 , occurring in a green, granular form: a minor ore of copper.
1830-40; named after Atacama Desert; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for atacamite

green, brilliant halide mineral, basic copper chloride [Cu2(OH)3Cl]. It is a secondary mineral, formed by the oxidation of other copper minerals, particularly under arid conditions; it is widespread as brittle, transparent to translucent crystals in Atacama Province, Chile; in Boleo, Mex.; and in South Australia. For detailed physical properties, see halide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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