mineral

Polished chrysocolla specimen

Chrysocolla, a hydrated copper silicate; commonly intergrown with quartz, malachite, or other copper minerals

AI-generated identification · may be incorrect

Blue-green to turquoise bands with a dull-to-waxy luster; typically amorphous, with no obvious cleavage. Chrysocolla hardness varies widely (about 2–4 Mohs), though quartz-rich material is much harder.

Identified October 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a secondary copper mineral in oxidized zones of copper deposits, where copper-rich fluids alter surrounding rocks. It is geologically recent relative to its host rocks; the specimen’s precise age cannot be determined from the image.

Uses & applications

Polished pieces are used in jewelry and collected as ornamental specimens; copper ores containing chrysocolla may also be mined for copper.

Geological facts

The vivid turquoise color comes from copper. Its appearance can resemble turquoise, but chrysocolla is generally softer and often occurs in mixed, banded material.

Field identification & locations

Look for distinctive blue-green color and irregular bands, often alongside dark copper minerals or quartz. Common sources include Arizona, Peru, Chile, and the Democratic Republic of the Congo.