mineral

Polished turquoise cabochon pendant

Turquoise, hydrated copper-aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing material

AI-generated identification · may be incorrect

Hardness 5–6 Mohs; turquoise-blue to green with brown/black limonite or host-rock matrix; waxy to dull luster; cryptocrystalline, opaque, and non-cleavable. The teardrop cabochon is polished and mounted as jewelry.

Identified September 13, 2026More mineral →

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At a glance

Common name: Polished turquoise cabochon pendant
Scientific name: Turquoise, hydrated copper-aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing material
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Approximately $10–$75 for common stabilized or commercial pendants; $100–$500+ for high-grade natural turquoise with attractive matrix and provenance.

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

Turquoise forms by near-surface weathering and hydrothermal alteration of aluminum-rich rocks in arid climates, commonly over copper deposits. Deposits are generally geologically young, often Cenozoic, though turquoise can form at various ages.

Uses & applications

Used primarily in jewelry, carving, inlay, and ornamentation; historically valued as a gemstone. Polishing, stabilization, dyeing, or resin impregnation commonly improves durability and color.

Geological facts

Green coloration reflects iron substitution, while blue indicates more copper. Matrix patterns and vivid blue-green color are diagnostic but can be imitated by dyed howlite, magnesite, or synthetic materials.

Field identification & locations

Common sources include Iran, Arizona and Nevada, China, Mexico, Chile, and Egypt. Field identification relies on opaque blue-green color, waxy surface, moderate softness, and copper-related occurrence; avoid destructive tests on jewelry.