ˌad.əˈkaˌmīt, əˈtakəˌm- noun
( -s )
Etymology: French, from Atacama desert, its locality + French -ite
: a mineral Cu 2 Cl(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)