gemstone

Turquoise (likely tumbled or polished)

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

AI-generated identification · may be incorrect

Opaque sky-blue material with dark matrix-like veining and a matte-to-waxy polish. Mohs hardness 5–6; triclinic crystal system, generally massive rather than visibly crystalline; specific gravity about 2.6–2.9. The image alone cannot confirm whether it is natural, stabilized, or imitation.

Identified October 6, 2026More gemstone →

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Physical properties

Formation & geological history

Forms as a secondary mineral when copper-bearing rocks weather in dry, oxidizing environments, often in fractures and cavities. Deposits occur in arid regions and are commonly geologically young relative to their host rocks.

Uses & applications

Used for beads, cabochons, inlay, and ornamental objects; also collected as a mineral specimen.

Geological facts

Its characteristic blue comes from copper; iron substitution can produce greener shades. Veining may be host-rock matrix, but appearance alone is not proof of authenticity.

Field identification & locations

Look for opaque blue-green color, natural-looking matrix, and a waxy surface; hardness and appearance are not definitive tests. Notable sources include Arizona, Nevada, Iran, China, and Mexico.