mineral

Turquoise bead bracelet

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

AI-generated identification · may be incorrect

Typically sky-blue to blue-green with waxy to subvitreous luster; Mohs hardness 5–6, cryptocrystalline structure, no visible cleavage, and specific gravity about 2.6–2.9. The dark beads are likely hematite, black spinel, or dyed accessory material;…

Identified August 8, 2026More mineral →

Explore Turquoise bead bracelet in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Natural turquoise forms as a secondary mineral in arid regions through groundwater alteration of aluminum- and copper-bearing rocks, commonly in Cenozoic weathering zones. Major sources include Iran, southwestern United States, China, Egypt, and Mexico.

Uses & applications

Used for cabochons, beads, carvings, and ornamental jewelry; historically valued for its color and cultural significance. Lower-grade material is often stabilized with resin to improve durability.

Geological facts

Turquoise is generally opaque and commonly shows brown, gray, or black matrix veining. Color can darken or turn green with porosity, oils, cosmetics, and prolonged exposure to heat or chemicals.

Field identification & locations

Identify genuine material by its opaque blue-green color, relatively low hardness, waxy luster, and cool feel; avoid destructive tests because dyes and treatments are common. A gemological laboratory is needed to distinguish natural, stabilized, reconstructed, and imitation beads.