Atacamite

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The crystal structure of atacamite is characterized by a complex arrangement of copper and bromine ions within a trigonal crystal system. The mineral's crystals typically exhibit a tabular or prismatic habit, with well-formed crystals displaying an emerald-green color due to the presence of chromium impurities. Atacamite forms through the oxidation of primary copper minerals in arid environments, often resulting from the interaction between copper-rich fluids and atmospheric oxygen.