mineral

Chrysocolla (Carved Egg)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (often intergrown with quartz, malachite, or chalcedony)

AI-generated identification · may be incorrect

Hardness: 2.5–7 (depending on silica content/chalcedony mix); Color: Forest green to vivid cyan-blue and olive; Luster: Vitreous to waxy/earthy; Crystal System: Orthorhombic (microcrystalline/amorphous); Cleavage: None; Specific Gravity: ~2.0–2.4 (pure) to >2.6 (silicified).

Hardness: 2
Color: Forest green to vivid cyan-blue and olive
Luster: Vitreous to waxy/earthy

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in the oxidation zones of copper-rich ore deposits, typically via the reaction of copper-bearing solutions with silica-rich groundwater. Associated with minerals like malachite, azurite, and chalcedony.

Uses & applications

Commonly carved into decorative items (such as eggs, spheres, and cabochons), utilized in jewelry, lapidary arts, and sought after by mineral collectors.

Geological facts

Pure chrysocolla is very soft and porous, sticking slightly to the tongue when touched, but when naturally infused with chalcedony (known as gem silica or chrysocolla chalcedony), it becomes durable enough to take a high glass-like polish.

Field identification & locations

Identified by its distinctive copper-green and turquoise color palette, lack of crystal faces, and association with copper oxidation zones. Major sources include the Democratic Republic of Congo, Peru, Mexico, Chile, and the southwest United States (Arizona).