mineral
Turquoise-colored stone chip necklace
Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O); appearance alone cannot rule out dyed howlite or another imitation.
AI-generated identification · may be incorrectIrregular polished blue-green chips with a mostly opaque, waxy-to-dull surface. Natural turquoise is triclinic, Mohs hardness 5–6, and commonly has dark matrix veining; the pictured stones show little obvious matrix.
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Physical properties
Irregular polished blue-green chips with a mostly opaque, waxy-to-dull surface. Natural turquoise is triclinic, Mohs hardness 5–6, and commonly has dark matrix veining; the pictured stones show little obvious matrix.
Formation & geological history
Turquoise forms as a secondary phosphate mineral in the oxidized zones of copper deposits, often in arid regions. Its age depends on the deposit and cannot be determined from the necklace.
Uses & applications
Used in jewelry and decorative objects; this strand is a fashion accessory.
Geological facts
Many turquoise beads are stabilized with resin or dyed, and blue-green howlite is also sold as turquoise. Testing the material would be needed to identify it confidently.
Field identification & locations
Natural turquoise is found in places including the southwestern United States, Iran, China, and Egypt. Look for natural color variation and matrix, but rely on a reputable gemologist or seller for confirmation.
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