Chrysocolla

Physical Properties

Hardness: 2.5-3.5 on Mohs scale (can be higher if silicated); Color: Cyan, turquoise-blue, or green; Luster: Vitreous to earthy; Crystal structure: Orthorhombic (usually cryptocrystalline); Cleavage: None; Specific Gravity: 2.0-2.4

Formation & Geological History

Secondary mineral formed in the oxidation zones of copper ore bodies. It results from the weathering of copper minerals such as chalcocite or chalcopyrite in the presence of silica. It is often found associated with malachite, azurite, and quartz.

Uses & Applications

Primarily used as a minor ore of copper, as a gemstone for jewelry (cabochons and beads), and as a popular specimen for mineral collectors.

Geological Facts

Chrysocolla has been used since ancient times for gemstone purposes and as a pigment. The name is derived from the Greek words 'chrysos' (gold) and 'kolla' (glue), referring to its use as a soldering agent for gold.

Field Identification & Locations

Identified in the field by its distinct blue-green color and its tendency to stick to the tongue due to its porous, hydrated nature. It is commonly found in arid regions such as Arizona (USA), Chile, Zaire, and Australia. Collectors should look for vibrant colors and 'gem silica' variants which are highly prized.

Identified on: 5/2/2026

Mode: Standard