Chrysocolla

Physical Properties

Hardness: 2.5-3.5 (Mohs), Color: Cyan/Green/Turquoise, Luster: Vitreous to dull, Crystal Structure: Orthorhombic (often massive/botryoidal), Specific Gravity: 2.0-2.4

Formation & Geological History

Secondary mineral formed in the oxidation zones of copper ore bodies. It precipitates from silica-rich groundwater reacting with primary copper minerals like chalcopyrite or malachite.

Uses & Applications

Minor copper ore, popular as a gemstone for jewelry (cabochons), and a highly sought-after collector mineral.

Geological Facts

The name comes from the Greek 'chrysos' (gold) and 'kolla' (glue), referring to its ancient use as a material for soldering gold.

Field Identification & Locations

Found in arid regions like Arizona, Chile, and the DRC. In the field, look for its distinctive bright blue-green color and the fact that it often sticks to the tongue due to its porous nature.

Identified on: 4/29/2026

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