atacamite

noun

at·​a·​cam·​ite

ˌatəˈkaˌmīt,

əˈtakəˌm-

plural -s

: 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)

Word History

Etymology

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

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