mineral

Polished turquoise-matrix cabochon

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O, with iron-rich matrix and possible chrysocolla

AI-generated identification · may be incorrect

Blue-green to dark green, mottled with brown/gray host matrix; waxy to subvitreous luster and opaque, microcrystalline structure. Mohs hardness 5–6; specific gravity about 2.6–2.9; no prominent cleavage.

Identified September 16, 2026More mineral →

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At a glance

Common name: Polished turquoise-matrix cabochon
Scientific name: Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O, with iron-rich matrix and possible chrysocolla
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $10–$60 for a small polished matrix cabochon; fine natural, untreated turquoise can exceed $100–$1,000 depending on color, provenance, and workmanship.

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 phosphate mineral in arid, oxidized copper deposits, commonly replacing or filling fractures in volcanic or sedimentary host rocks. Most deposits are Cenozoic to older hydrothermal-weathering systems; the exact age is locality-dependent.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; historically important in jewelry and ceremonial art. Matrix-rich material is generally less valuable than clear, evenly colored turquoise.

Geological facts

The blue-green color comes mainly from copper, while iron commonly shifts it toward green and produces brown webbing or matrix. Polishing can enhance contrast but may involve stabilization with resin.

Field identification & locations

Identify by its opaque blue-green color, relatively low hardness, waxy luster, and copper-stained matrix; avoid confusing it with dyed howlite, magnesite, or plastic. Common sources include Iran, Arizona, Nevada, China, Mexico, and Chile.