gemstone
Turquoise
CuAl6(PO4)4(OH)8·4H2O
AI-generated identification · may be incorrectMohs hardness 5-6, robin's egg blue to greenish-blue color, waxy to subvitreous luster, triclinic crystal system.
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Physical properties
Mohs hardness 5-6, robin's egg blue to greenish-blue color, waxy to subvitreous luster, triclinic crystal system.
Formation & geological history
Forms by the action of meteoric waters percolating through copper-bearing rocks in arid climates.
Uses & applications
Extensively used in jewelry making, ornamental carvings, and inlay work.
Geological facts
Turquoise is one of the world's most ancient gem materials, prized by the ancient Egyptians and Native Americans.
Field identification & locations
Identified by its distinctive blue-green color and dark web-like matrix veins; commonly found in the southwestern United States, Iran, and China.
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