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Atacamite

Atacamite – Cu₂Cl(OH)₃

Elements: Copper, Chlorine, Oxygen, Hydrogen

Class: Halides

Crystal System: Orthorhombic

Hardness: 3-3.5

Calcite

Talc (1)Diamond (10)

A copper coin can scratch it.

Origin: Mount Gunson Copper Mine, South Australia – Australia