mineral

Blue-green copper mineral-bearing rock, likely chrysocolla with malachite

Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O) with malachite (Cu₂CO₃(OH)₂), possibly in altered host rock

AI-generated identification · may be incorrect

Typically turquoise-blue to green, opaque, earthy to waxy or vitreous luster, amorphous or cryptocrystalline, and Mohs hardness about 2.5–4; malachite commonly forms green bands or patches. The specimens appear rough and massive, with no obvious cleavage.

Identified September 20, 2026More mineral →

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At a glance

Common name: Blue-green copper mineral-bearing rock, likely chrysocolla with malachite
Scientific name: Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O) with malachite (Cu₂CO₃(OH)₂), possibly in altered host rock
Category: mineral
Identified: September 20, 2026
Method: Standard

AI Estimated Value

About $5–$25 for these rough hand specimens; attractive polished or gem-silica material can range from $30 to several hundred dollars.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms in oxidized zones above copper deposits when copper-rich fluids alter silica- and aluminum-bearing rock; commonly associated with quartz, limonite, azurite, and native copper. Formation is generally geologically young relative to the host deposit, occurring during near-surface weathering.

Uses & applications

Used as a decorative stone, cabochon material, pigment historically, and copper ore when abundant; attractive polished material has modest lapidary value.

Geological facts

Chrysocolla’s intense blue-green color comes from hydrated copper; it is often sold commercially as “chrysocolla-malachite” or “gem silica” when silica-rich and durable.

Field identification & locations

Look for blue-green color, irregular mottling, association with brown iron oxides, and a soft scratch response; avoid acids and prolonged soaking. Common localities include Arizona, Nevada, Chile, Peru, the Democratic Republic of Congo, and Russia.