mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Hardness: 5-6 Mohs; Color: Sky blue to apple green; Luster: Waxy to subvitreous; Crystal structure: Triclinic (usually cryptocrystalline); Cleavage: Perfect (rarely seen); Specific gravity: 2.6-2.9

Hardness: 5-6 Mohs
Color: Sky blue to apple green
Luster: Waxy to subvitreous

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 5-6 Mohs; Color: Sky blue to apple green; Luster: Waxy to subvitreous; Crystal structure: Triclinic (usually cryptocrystalline); Cleavage: Perfect (rarely seen); Specific gravity: 2.6-2.9

Formation & geological history

Secondary mineral formed in the oxidation zones of copper deposits by the percolation of meteoric water through aluminous rock in arid environments.

Uses & applications

Primarily used in jewelry (cabochons, beads, and inlay) and as a highly prized collector specimen; historically used for amulets and decorative ornaments.

Geological facts

One of the first gemstones ever mined, turquoise was highly valued by the Egyptians as early as 3000 BCE and held deep spiritual significance for Native American tribes in the Southwest US.

Field identification & locations

Identify by its distinctive blue-green color and waxy luster; often contains dark matrix veins (limonite or manganese oxide). Commonly found in Iran, Southwestern USA, China, and Egypt.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral