gemstone
Turquoise
CuAl6(PO4)4(OH)8·4H2O
AI-generated identification · may be incorrectMohs hardness of 5 to 6, blue to green color, waxy to sub-vitreous luster, and triclinic crystal system.
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Physical properties
Mohs hardness of 5 to 6, blue to green color, waxy to sub-vitreous luster, and triclinic crystal system.
Formation & geological history
Formed by the weathering and oxidation of pre-existing copper-bearing minerals in arid climates.
Uses & applications
Widely used in jewelry making, ornamental carvings, and holistic collecting.
Geological facts
Turquoise is one of the world's most ancient gemstones, prized by the ancient Egyptians and Native Americans.
Field identification & locations
Easily identified by its distinct robin's-egg blue or greenish coloration and matrix webbing; commonly found in the southwestern United States and Iran.
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