mineral

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Hardness: 2.5-3.5 (variable); Color: Cyan (blue-green) to green; Luster: Vitreous to earthy; Crystal structure: Monoclinic (usually cryptocrystalline); Cleavage: None; Specific Gravity: 2.0-2.4

Hardness: 2
Color: Cyan (blue-green) to green
Luster: Vitreous to earthy

Identified June 14, 2026More mineral →

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Physical properties

Hardness: 2.5-3.5 (variable); Color: Cyan (blue-green) to green; Luster: Vitreous to earthy; Crystal structure: Monoclinic (usually cryptocrystalline); Cleavage: None; Specific Gravity: 2.0-2.4

Formation & geological history

Secondary mineral formed in the oxidation zones of copper ore bodies where copper-bearing solutions react with silica-rich water. It is typically found in arid climates.

Uses & applications

Primarily used as a minor ore of copper, a gemstone for jewelry (cabochons and beads), and as a popular specimen for collectors due to its striking color.

Geological facts

Chrysocolla has been used since antiquity; its name comes from the Greek words 'chrysos' (gold) and 'kolla' (glue), referring to its ancient use as a material for soldering gold. It is often found intergrown with quartz (Chrysocolla Chalcedony) or malachite.

Field identification & locations

Identified in the field by its distinct cyan color and its tendency to stick to the tongue due to its porous nature. Commonly found in Arizona (USA), Chile, Peru, and Congo. Collectors look for high silicate content which increases durability.

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mineral