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Mineralpedia Details for Atacamite

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Atacamite

Atacamite

Formula
Cu2Cl(OH)3 
Crystal System
Orthorhombic 
Crystal Habit
Euhedral Crystals, Fibrous, Granular 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
green, yellow, yellow green, black green 
Streak
apple green 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
3-3.5 
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Atacamite from Chuquicamata mine, El Loa Prov., Antofagasta, Chile

Atacamite
            from Chuquicamata mine, El Loa Prov., Antofagasta, Chile

Deep green lustrous crystals of Atacamite to 2mm occupying large vug.

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Atacamite from La Farola mine, Tierra Amarilla, Copiapó, Chile

Atacamite
            from La Farola mine, Tierra Amarilla, Copiapó, Chile

Deep dark green long bladed crystals to 6mm.

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Atacamite from Kintore Opencut, Broken Hill, New South Wales, Australia

Atacamite
            from Kintore Opencut, Broken Hill, New South Wales, Australia

Beautiful deep emerald green bladed crystals of atacamite about to 0.75mm. The Chlorargyrite occurs as tiny tellow crystals in corroded and altered Galena.

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Atacamite from Southwest mine, Bisbee, Cochise Co., Arizona, United States

Atacamite
            from Southwest mine, Bisbee, Cochise Co., Arizona, United States

A very complex specimen with a rather large single and thick prismatic crystal of Atacamite to 4mm and a few smaller. There are also numerous Cuprite crystals totally covered with acicular Connellite and an unknown acicular sprays of green crystals, perhaps just Malachite. 

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Atacamite from Mt. Gunson mine, Pernatty Lagoon, South Australia, Australia

Atacamite
            from Mt. Gunson mine, Pernatty Lagoon, South Australia, Australia

Nicely crystallized acicular Atacamite crystals in free-standing sprays to 1mm.

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