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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Origin and Etymology of atacamite
French, from Atacama desert, its locality + French -ite
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