mineral

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Hardness: 5-6 (Mohs), Color: Sky blue to blue-green with metallic gold-tone inclusions, Luster: Waxy to subvitreous, Crystal structure: Triclinic (usually massive), Cleavage: Perfect (rarely seen in massive form), Specific gravity: 2.6-2.9

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Secondary mineral formed by the action of percolating acidic solutions during the weathering and oxidation of pre-existing copper-bearing minerals in volcanic or sedimentary rocks. Usually found in arid regions.

Uses & applications

Primarily used in jewelry (cabochons, beads, and inlay) and as a lapidary material for ornamental carvings. Highly valued by collectors for the presence of metallic 'matrix' like pyrite.

Geological facts

Turquoise is one of the oldest gemstones in human history, used by Egyptians since 3000 BCE and highly sacred in Native American cultures. The presence of pyrite within the blue stone is often associated with the Kingman mine in Arizona.

Field identification & locations

Identify by its unique 'robin\'s egg' blue color and metallic inclusions that do not scratch easily like paint. Found in arid climates like the Southwestern USA, Iran, and China. Collectors should look for natural color and high polish.

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