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Atacamite Formula: Cu2(OH)3ClSystem: OrthorhombicColour: Bright green, dark …Lustre: Adamantine, VitreousHardness: 3 – 3½ Libethenite Formula: Cu2(PO4)(OH)System: OrthorhombicColour: Light to dark green, …Lustre: Sub-Vitreous, Resinous, Waxy, GreasyHardness: 4 Photo by: © Tóth László Geology IN