mineral

Polished chrysocolla (possibly chrysocolla-in-quartz)

Chrysocolla, a hydrated copper silicate; commonly approximated as Cu₂H₂Si₂O₅(OH)₄·nH₂O

AI-generated identification · may be incorrect

Opaque, polished blue-green material with dark matrix; chrysocolla is typically Mohs 2–4, vitreous to waxy, and lacks a distinct crystal structure or cleavage. The photo alone cannot confirm whether the dark areas are host rock or another mineral.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a secondary copper mineral in oxidized zones of copper deposits, often alongside quartz, malachite, and other copper minerals. Such deposits occur in rocks of many ages; the specimen’s age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, and decorative specimens; softer material is usually set in protective jewelry settings. It is not generally used as a structural building stone.

Geological facts

Chrysocolla’s vivid color comes from copper, and it commonly occurs as crusts or masses rather than well-formed crystals.

Field identification & locations

Look for blue-green color in copper-bearing zones and test cautiously: genuine chrysocolla is relatively soft, while quartz-rich material is harder. Common sources include copper districts in Arizona, Chile, Peru, and the Democratic Republic of the Congo.