mineral
Tumbled turquoise-bearing stone (likely turquoise or chrysocolla)
Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; possible chrysocolla: hydrated copper silicate
AI-generated identification · may be incorrectSmall polished/tumbled specimen with blue-green color and gray-brown matrix; typically waxy to dull luster, cryptocrystalline structure, no visible cleavage, and Mohs hardness about 2–6 (turquoise ~5–6; chrysocolla ~2–4).
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Physical properties
Small polished/tumbled specimen with blue-green color and gray-brown matrix; typically waxy to dull luster, cryptocrystalline structure, no visible cleavage, and Mohs hardness about 2–6 (turquoise ~5–6; chrysocolla ~2–4).
Formation & geological history
Copper-rich groundwater alters aluminum- or silica-bearing rocks, forming turquoise or chrysocolla in veins and cavities, generally in arid regions over geologically recent to ancient weathering zones.
Uses & applications
Used as a semiprecious gemstone, beads, carvings, and decorative objects; softer material is often stabilized, dyed, or coated for durability.
Geological facts
Blue-green copper minerals can be difficult to distinguish visually, and many commercial specimens are composites or treated. A matrix pattern is common in turquoise from several deposits.
Field identification & locations
Common sources include Iran, the American Southwest, Mexico, Chile, China, and Australia. Confirm identity with hardness, specific gravity, magnification, and professional testing; avoid destructive tests on polished pieces.
