mineral

Polished blue-green stone, likely chrysocolla or chrysocolla-bearing chalcedony

Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; exact identification requires testing

AI-generated identification · may be incorrect

Blue-green, opaque, waxy to dull luster, commonly amorphous or microcrystalline; Mohs hardness 2–4 for chrysocolla, higher if mixed with chalcedony. The smooth oval shape indicates tumbling or cabochon polishing.

Identified September 21, 2026More mineral →

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At a glance

Common name: Polished blue-green stone, likely chrysocolla or chrysocolla-bearing chalcedony
Scientific name: Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; exact identification requires testing
Category: mineral
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small polished common cabochon; $30–$150+ for unusually vivid, patterned, or hard chrysocolla-chalcedony.

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 as a secondary copper-mineral deposit during weathering and oxidation, often coating or replacing host rock. Commonly associated with malachite, azurite, quartz, and limonite in relatively young near-surface ore zones.

Uses & applications

Used for cabochons, beads, carvings, and collector specimens; harder chrysocolla-chalcedony varieties are preferred for jewelry. Soft material should be protected from scratches, chemicals, and prolonged soaking.

Geological facts

Its vivid color comes from copper; color intensity and hardness vary greatly with quartz content. It may be confused with turquoise, variscite, or dyed agate.

Field identification & locations

Common sources include Arizona, Nevada, Chile, Peru, Mexico, Australia, and the Democratic Republic of the Congo. Field clues are blue-green color and copper-mineral association; hardness and streak testing help distinguish it from turquoise.