mineral
Small tumbled blue-green stone, possibly chrysocolla or turquoise
Indeterminate copper-bearing mineral; possible chrysocolla (Cu₂H₂Si₂O₅(OH)₄·nH₂O) or turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O)
AI-generated identification · may be incorrectBlue-green, opaque to slightly translucent, with a dull-to-waxy luster and irregular natural texture; apparent hardness may be about Mohs 2–6 depending on species. The tiny polished/tumbled form prevents reliable identification of cleavage or crystal structure.
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Physical properties
Blue-green, opaque to slightly translucent, with a dull-to-waxy luster and irregular natural texture; apparent hardness may be about Mohs 2–6 depending on species. The tiny polished/tumbled form prevents reliable identification of cleavage or crystal structure.
Formation & geological history
Copper minerals such as chrysocolla and turquoise form in oxidized zones above copper deposits, commonly during weathering over millions of years. The specimen appears human-shaped or tumbled.
Uses & applications
Turquoise is used in jewelry and ornament; chrysocolla is mainly a collector and lapidary material. Low-grade pieces may be stabilized, dyed, or composite-treated.
Geological facts
Color alone is insufficient because several copper minerals—and dyed stones—look similar. A mineralogical identification requires a sharper image, locality, streak, hardness, and ideally chemical testing.
Field identification & locations
Common sources include Arizona, Nevada, New Mexico, Chile, Peru, Iran, and Australia. Turquoise is typically opaque with a waxy surface and may show dark matrix; chrysocolla is often softer and more mottled.
