
gemstone
Carved turquoise arrowhead/pendant
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
AI-generated identification · may be incorrectBlue-green, opaque to slightly translucent, waxy to subvitreous luster; Mohs hardness 5–6, triclinic structure, poor cleavage, and specific gravity about 2.6–2.9. The object appears carved and polished, with possible brown host-matrix or staining.
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Physical properties
Blue-green, opaque to slightly translucent, waxy to subvitreous luster; Mohs hardness 5–6, triclinic structure, poor cleavage, and specific gravity about 2.6–2.9. The object appears carved and polished, with possible brown host-matrix or staining.
Formation & geological history
Turquoise forms as a secondary mineral in arid, copper-rich, aluminum- and phosphate-bearing rocks through groundwater alteration, commonly during Cenozoic weathering. It is not possible to determine the specimen’s geological age from the image.
Uses & applications
Used for jewelry, beads, carvings, and ornaments; historically valued by many cultures. Inferior or stabilized turquoise is also common in commercial craftwork.
Geological facts
Its blue color comes mainly from copper, while green tones can reflect iron or dehydration. Color, hardness, and appearance can be imitated by dyed howlite, plastic, or composite materials.
Field identification & locations
Common sources include Iran, the southwestern United States, China, Chile, and Mexico. Confirm with testing: turquoise is opaque, softer than quartz, and should not scratch glass reliably; avoid destructive tests on a carved piece.
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