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Atacamite is a copper halide mineral: a copper(II) chloride hydroxide with the chemical formula Cu2Cl(OH)3. It was first described in 1802 by Dmitri Alekseyevich Golitsyn from deposits in Chile's Atacama Desert, after which it is named. Atacamite is a comparatively rare mineral, formed from primary copper minerals in the oxidation or weathering zone of arid climates. It has also been reported as a volcanic sublimate from fumarole deposits, as sulfide alteration products in black smokers. This photograph shows a specimen of atacamite, on a malachite matrix, from the Mount Gunson Mines in South Australia. The picture was focus-stacked from 42 separate images.Photograph credit: Ivar Leidus
June 26, 2025 Current UTC time and date ()
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