mineral
Tumbled turquoise (probable)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
AI-generated identification · may be incorrectBlue-green, opaque, waxy to subvitreous luster; Mohs hardness 5–6, cryptocrystalline structure, and no visible cleavage. The dark brown/black matrix and relatively uniform rounded polish are consistent with stabilized or treated turquoise, though chrysocolla or dyed howlite cannot be excluded from the image.
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Physical properties
Blue-green, opaque, waxy to subvitreous luster; Mohs hardness 5–6, cryptocrystalline structure, and no visible cleavage. The dark brown/black matrix and relatively uniform rounded polish are consistent with stabilized or treated turquoise, though chrysocolla or dyed howlite cannot be excluded from the image.
Formation & geological history
Forms as a secondary mineral in arid, oxidized copper deposits, commonly replacing host rock in fractures and cavities. It is geologically young compared with its host rocks, generally forming during weathering and groundwater circulation over millions of years.
Uses & applications
Used for cabochons, beads, carvings, and ornamental objects; historically important in jewelry and ceremonial art. Lower-grade material is often stabilized with resin to improve durability.
Geological facts
Major historic sources include Iran, the southwestern United States, China, Mexico, Chile, and Egypt. Turquoise’s blue color reflects copper, while green shades commonly indicate iron or dehydration.
Field identification & locations
Identify by its opaque blue-green color, low-to-moderate hardness, waxy polish, and natural matrix; avoid prolonged soaking, chemicals, heat, and ultrasonic cleaning. A gemological test is needed to distinguish natural from stabilized or imitation material.
