gemstone

Turquoise cabochon

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

AI-generated identification · may be incorrect

Opaque blue-green, polished and likely matrix-bearing; waxy to subvitreous luster, triclinic structure, Mohs hardness 5–6, specific gravity about 2.6–2.9. The photo alone cannot confirm whether it is natural, stabilized, or imitation.

Identified October 8, 2026More gemstone →

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Physical properties

Formation & geological history

Forms as a secondary mineral in arid-zone weathering deposits where copper-bearing fluids react with aluminum- and phosphorus-rich rocks; deposits range from geologically young to ancient.

Uses & applications

Used in jewelry, beads, and ornamental objects; lower-grade material is also used for carvings and collectibles.

Geological facts

Its color comes chiefly from copper, while iron can contribute green tones; many commercial pieces are stabilized with resin to improve durability.

Field identification & locations

Common sources include the southwestern United States, Iran, China, and Mexico. Look for natural color variation and matrix, but gemological testing is needed to distinguish natural turquoise from treated or imitation material.