gemstone

Turquoise

CuAl6(PO4)4(OH)8·4H2O

AI-generated identification · may be incorrect

Hardness: 5-6, Color: Light blue to green, Luster: Waxy to subvitreous, Crystal structure: Triclinic, Cleavage: Good, Specific gravity: 2.6-2.9. It is characterized by its typical blue-green coloration and often features a prominent, dark matrix webbing.

Identified July 26, 2026More gemstone →

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At a glance

Common name: Turquoise
Scientific name: CuAl6(PO4)4(OH)8·4H2O
Category: gemstone
Identified: July 26, 2026
Method: Advanced

AI Estimated Value

Market value varies widely. Lower-grade, matrix-heavy or stabilized turquoise might sell for $1 to $5 per carat. High-grade natural turquoise with striking color and a fine matrix can fetch upwards of $50 to $100+ per carat, particularly if originating from a famous, closed mine.

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

Turquoise forms through the weathering and oxidation of pre-existing minerals in a secondary process. It is typically found in arid regions, forming in the cavities and veins of weathered aluminum-rich, volcanic, and sedimentary rocks, often associated with copper deposits.

Uses & applications

Widely used for ornamental and jewelry purposes due to its distinctive color and striking matrix patterns. Often cut into cabochons, carved, or inlaid.

Geological facts

Prized by many ancient cultures, including Ancient Egypt, Persia, and Native American societies, who considered it a holy stone and a bringer of good fortune. It has historically been used in everything from royal ornaments to religious artifacts.

Field identification & locations

Identified by its distinctive color and typical matrix. The specific patterns and hues often indicate the exact mine of origin (e.g., Sleeping Beauty, Kingman, or Royston). Collectors value untreated, natural stones with striking color and well-defined spiderweb matrices.