mineral

Polished turquoise-like stone

Likely turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the photo

AI-generated identification · may be incorrect

Blue-green to pale green, waxy to dull luster, massive rather than visibly crystalline, Mohs hardness about 5–6, and specific gravity about 2.6–2.9; the rounded surface appears polished or naturally smoothed.

Identified September 16, 2026More mineral →

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At a glance

Common name: Polished turquoise-like stone
Scientific name: Likely turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the photo
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small uncertain or common polished piece; verified natural, attractive turquoise may 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

Turquoise forms as a secondary mineral in arid, oxidized copper deposits, commonly replacing host rock along fractures. Most deposits are Cenozoic to older, with age varying by locality.

Uses & applications

Used as a cabochon, bead, carving material, and collector specimen; lower-grade material is also stabilized, dyed, or reconstituted for jewelry.

Geological facts

Natural turquoise commonly contains brown or black limonite/matrix veining, while pale green color can reflect iron substitution or weathering. Similar-looking materials include chrysocolla, variscite, amazonite, and dyed magnesite.

Field identification & locations

Check for a nonmetallic waxy luster, moderate hardness, opaque blue-green color, and copper-associated matrix; a gemological test or spectroscopy is needed for confirmation. Common sources include Iran, Arizona, Nevada, China, Chile, and Mexico.