mineral

Tumbled blue-green stone, likely turquoise or chrysocolla

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper aluminosilicate

AI-generated identification · may be incorrect

Pale blue-green, opaque, waxy to dull luster, irregularly tumbled surface, and brown matrix or staining. Turquoise hardness is Mohs 5–6; chrysocolla is softer, about 2.5–3.5. Exact identification requires testing because the image cannot resolve mineral structure.

Identified September 19, 2026More mineral →

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At a glance

Common name: Tumbled blue-green stone, likely turquoise or chrysocolla
Scientific name: Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper aluminosilicate
Category: mineral
Identified: September 19, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small common rough/tumbled piece; attractive natural turquoise may sell for $20–$100+, depending on color, matrix, locality, and treatment.

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

These copper minerals form in arid-zone oxidation zones above copper deposits, commonly as veins, nodules, or coatings. They are generally young secondary minerals formed during weathering rather than primary igneous or metamorphic rocks.

Uses & applications

Used as ornamental stone, beads, cabochons, carvings, and jewelry; turquoise has substantially greater value than common chrysocolla or dyed imitations.

Geological facts

Natural turquoise commonly contains brown, gray, or black host-rock matrix. The pale color and soft-looking texture may also indicate howlite or dyed magnesite, so visual identification alone is uncertain.

Field identification & locations

Check for a waxy surface, natural matrix, and hardness; turquoise should not scratch easily with a steel knife, while chrysocolla and imitations may. Common sources include Iran, the southwestern United States, China, Chile, and Mexico.