mineral
Tumbled blue-green stone, likely turquoise or chrysocolla
Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper aluminosilicate
AI-generated identification · may be incorrectPale blue-green, opaque, waxy to dull luster, irregularly tumbled surface, and brown matrix or staining. Turquoise hardness is Mohs 5–6; chrysocolla is softer, about 2.5–3.5. Exact identification requires testing because the image cannot resolve mineral structure.
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Physical properties
Pale blue-green, opaque, waxy to dull luster, irregularly tumbled surface, and brown matrix or staining. Turquoise hardness is Mohs 5–6; chrysocolla is softer, about 2.5–3.5. Exact identification requires testing because the image cannot resolve mineral structure.
Formation & geological history
These copper minerals form in arid-zone oxidation zones above copper deposits, commonly as veins, nodules, or coatings. They are generally young secondary minerals formed during weathering rather than primary igneous or metamorphic rocks.
Uses & applications
Used as ornamental stone, beads, cabochons, carvings, and jewelry; turquoise has substantially greater value than common chrysocolla or dyed imitations.
Geological facts
Natural turquoise commonly contains brown, gray, or black host-rock matrix. The pale color and soft-looking texture may also indicate howlite or dyed magnesite, so visual identification alone is uncertain.
Field identification & locations
Check for a waxy surface, natural matrix, and hardness; turquoise should not scratch easily with a steel knife, while chrysocolla and imitations may. Common sources include Iran, the southwestern United States, China, Chile, and Mexico.
