mineral

Tumbled blue-green stone, likely turquoise or chrysocolla

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

AI-generated identification · may be incorrect

Opaque blue-green, waxy to subvitreous luster, smooth tumbled surface; typical hardness is Mohs 2–6, depending on species and treatment. The photograph is insufficient to distinguish turquoise from chrysocolla or dyed material.

Identified August 24, 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 silicate
Category: mineral
Identified: August 24, 2026
Method: Standard

AI Estimated Value

About $2–$20 for a small common tumbled or treated piece; fine natural turquoise can range from $50 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

Copper-bearing minerals formed in arid, oxidized zones above copper deposits, commonly during weathering over millions of years. Major sources include Arizona, Nevada, Iran, China, Chile, and Peru.

Uses & applications

Cut and polished for cabochons, beads, carvings, and inexpensive jewelry; turquoise also has longstanding ornamental and cultural significance.

Geological facts

Turquoise commonly shows brown or black limonite matrix, while chrysocolla is generally softer and may have glassy blue-green color zoning. Color enhancement, stabilization, or dyeing is common in commercial specimens.

Field identification & locations

Check hardness cautiously, avoid scratching the specimen, and use magnification for matrix and polish clues; copper staining and a waxy surface support turquoise-group minerals. Reliable identification requires specific-gravity, hardness, spectroscopy, or chemical testing.