mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
AI-generated identification · may be incorrectMohs hardness of 5 to 6; distinct robin's egg blue to greenish-blue color; waxy to sub-vitreous luster; triclinic crystal system.
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Physical properties
Mohs hardness of 5 to 6; distinct robin's egg blue to greenish-blue color; waxy to sub-vitreous luster; triclinic crystal system.
Formation & geological history
Forms by the action of meteoric waters percolating through copper-bearing aluminum rocks in arid climates.
Uses & applications
Widely used as a gemstone in fine jewelry, ornamental carvings, and inlay work.
Geological facts
Turquoise is one of the oldest gemstones in history, prized by ancient civilizations like the Egyptians and Native Americans.
Field identification & locations
Identified by its signature blue-green hue and sometimes dark spiderweb matrix; commonly found in the Southwestern United States, Iran, and China.
