gemstone

Turquoise (likely stabilized or composite)

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

AI-generated identification · may be incorrect

Blue to blue-green, typically waxy to subvitreous luster; Mohs hardness 5–6, triclinic structure, no prominent cleavage, and specific gravity about 2.6–2.8. The specimen appears set in silver and may contain dark matrix or treated material.

Identified September 16, 2026More gemstone →

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At a glance

Common name: Turquoise (likely stabilized or composite)
Scientific name: Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
Category: gemstone
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $20–$150 for common treated turquoise jewelry; $200–$2,000+ for high-grade natural turquoise, depending on origin, matrix, craftsmanship, and silver content.

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 mineral in arid, copper-rich zones through groundwater alteration of aluminum- and phosphorus-bearing rock, commonly during the Cenozoic. The image shows a polished cabochon rather than its host rock.

Uses & applications

Used chiefly in jewelry and ornamental objects. Commercial turquoise is often stabilized with resin, dyed, reconstituted, or mounted as a cabochon.

Geological facts

The blue color comes mainly from copper; greener tones commonly reflect iron or dehydration. The dark web-like pattern may be natural matrix, though appearance alone cannot distinguish it from added matrix or composite turquoise.

Field identification & locations

Common sources include Iran, southwest United States, China, Chile, and Mexico; it is not especially diagnostic of the Lisbon-area region. Field tests include hardness and density, but avoid scratching jewelry—laboratory testing is needed to detect treatments.