mineral

Blue copper-mineral rock, likely chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate), possibly with malachite, quartz, or host rock

AI-generated identification · may be incorrect

Blue-green to vivid blue, typically dull to waxy luster, massive and botryoidal rather than crystalline; Mohs hardness about 2–4, with generally poor or absent cleavage. The specimen appears weathered and matrix-rich, so exact identification requires testing.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in oxidized zones above copper deposits when copper-bearing fluids react with silica-rich rock, commonly during the Cenozoic or older supergene weathering. Common localities include Arizona, Nevada, Chile, Peru, the Democratic Republic of Congo, and Australia.

Uses & applications

Attractive material is cut for cabochons and carvings; copper-bearing ore is mined primarily for copper production. Lower-grade pieces are sold as decorative or educational specimens.

Geological facts

Chrysocolla’s intense color comes from hydrated copper ions; it is often confused with turquoise, azurite, or blue slag. Acid, hardness, streak, and copper-mineral testing can help distinguish it.

Field identification & locations

Look for blue-green coloration in irregular masses within oxidized copper zones, often alongside green malachite and black/brown iron oxides. Avoid relying on color alone; a gemological or mineralogical test is recommended.