mineral

Polished turquoise sphere with purple matrix/inclusion

Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O

AI-generated identification · may be incorrect

Hardness 5–6 Mohs; blue-green to turquoise with pale matrix and a purple central patch, likely dyed or included material; typically waxy to subvitreous luster and cryptocrystalline structure, with no obvious cleavage. The spherical shape is human-polished.

Identified September 6, 2026More mineral →

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At a glance

Common name: Polished turquoise sphere with purple matrix/inclusion
Scientific name: Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O
Category: mineral
Identified: September 6, 2026
Method: Standard

AI Estimated Value

About $10–$40 for a small common treated or low-grade sphere; $50–$200+ if natural, untreated, and provenance-supported.

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 as a secondary mineral in arid, copper-rich zones through groundwater alteration of aluminum- and phosphorus-bearing rocks, commonly during the Cenozoic. Purple coloration may reflect manganese minerals, another inclusion, or surface treatment.

Uses & applications

Used for cabochons, beads, carvings, and decorative objects; lower-grade turquoise is often stabilized, dyed, or assembled. Common polished spheres generally have modest value.

Geological facts

Major sources include Iran, Arizona and Nevada, China, Mexico, and Chile. The unusual purple center is not typical of pure turquoise and may indicate a composite or treated specimen.

Field identification & locations

Identify by its opaque blue-green color, relatively low hardness, waxy feel, and copper-rich context; avoid prolonged soaking, heat, acids, and harsh cleaners. A gemological test is needed to distinguish natural turquoise from dyed or reconstituted material.