mineral

Tumbled turquoise (likely dyed or stabilized)

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

AI-generated identification · may be incorrect

Blue-green, opaque, waxy to dull luster; Mohs hardness 5–6, cryptocrystalline/triclinic structure, no distinct cleavage, specific gravity about 2.6–2.8. The rounded, glossy form indicates tumbling and possible stabilization or dyeing.

Identified September 1, 2026More mineral →

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At a glance

Common name: Tumbled turquoise (likely dyed or stabilized)
Scientific name: Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled or treated piece; fine natural, untreated turquoise can 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

Forms as a secondary mineral in arid copper deposits when phosphate-rich groundwater alters aluminum-bearing rocks, commonly in Cenozoic to older weathering zones. Major sources include Iran, the southwestern United States, China, Egypt, and Mexico.

Uses & applications

Used for cabochons, beads, carvings, inlay, and ornamental objects; historically valued in jewelry and ceremonial art. Low-grade material is often stabilized with resin to improve durability.

Geological facts

Natural turquoise commonly shows brown, black, or reddish matrix veining, though some varieties are nearly matrix-free. Its blue color comes primarily from copper, while greener tones reflect iron substitution or weathering.

Field identification & locations

Identify by its opaque blue-green color, relatively low hardness, waxy texture, and porous feel; plastic imitations are unusually light and warm quickly. A hardness, density, or acetone test can help detect treatments, but laboratory testing is needed for certainty.