gemstone

Likely turquoise (polished cabochon)

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

AI-generated identification · may be incorrect

The small pale blue-green, opaque polished stone may be turquoise, though the image alone is insufficient for confident identification. Turquoise is Mohs 5–6, typically waxy to subvitreous, and microcrystalline; it commonly has a blue-to-green color and may show matrix veining.

Identified October 15, 2026More gemstone →

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Physical properties

Formation & geological history

Forms as a secondary mineral in arid-zone copper deposits, where phosphate-rich water alters aluminum-bearing rock; deposits are generally geologically young relative to their host rocks.

Uses & applications

Used for cabochons, beads, and decorative inlay; lower-grade material is also used for carvings and collectibles.

Geological facts

Turquoise color varies with copper and iron content, and many commercial pieces are stabilized with resin; treatment cannot be established from this photo.

Field identification & locations

Confirm with close inspection and gemological testing, since pale stones can resemble other minerals or imitation material. Notable sources include the southwestern United States, Iran, and China.