at·​a·​cam·​ite | \ ˌatəˈkaˌmīt, əˈtakəˌm- \
plural -s

Definition of atacamite

: a mineral Cu2Cl(OH)3 consisting of a basic copper chloride that is transparent or translucent and of various shades of green and occurs usually in prismatic orthorhombic crystals but also in crystalline aggregates or in massive form (hardness 3–3.5, specific gravity 3.75–3.77)

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History and Etymology for atacamite

French, from Atacama desert, its locality + French -ite

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Cite this Entry

“Atacamite.” Dictionary, Merriam-Webster, Accessed 22 Sep. 2020.

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