gemstone

Tumbled turquoise (probable)

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

AI-generated identification · may be incorrect

Blue-green, opaque, waxy to subvitreous luster, typically microcrystalline and massive; Mohs hardness 5–6, with no visible cleavage and specific gravity about 2.6–2.8. The polished surface and mottled blue-green color are consistent with turquoise, though dyed magnesite or chrysocolla cannot be excluded from the image…

Identified August 18, 2026More gemstone →

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Physical properties

Formation & geological history

Forms as a secondary mineral in arid regions when copper-rich groundwater alters aluminum- and phosphate-bearing rocks, commonly in veins and nodules. Deposits range from relatively young weathering zones to Mesozoic and older host rocks.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; historically important in jewelry and ceremonial art. High-quality, untreated turquoise is collectible.

Geological facts

Common localities include Iran, the American Southwest, Mexico, China, Chile, and Egypt. Natural turquoise often shows brown or black host-rock matrix, while uniform vivid color may indicate stabilization or dyeing.

Field identification & locations

Test cautiously: turquoise is opaque, relatively soft, and may show a blue streak; avoid destructive tests on a polished piece. Value is approximately $5–$30 for a small common tumbled or treated stone, and $50–$300+ for verified natural quality material.