metamorphic
Tumbled olive-green stone, possibly serpentine or nephrite jade
Undetermined; likely serpentine (Mg₃Si₂O₅(OH)₄) or nephrite, a tremolite–actinolite amphibole aggregate
AI-generated identification · may be incorrectSmooth, opaque olive-green surface with a waxy to subdued luster. Serpentine is Mohs 2.5–5.5; nephrite is 6–6.5 and notably tough; photo alone cannot distinguish them or establish crystal structure.
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Physical properties
Smooth, opaque olive-green surface with a waxy to subdued luster. Serpentine is Mohs 2.5–5.5; nephrite is 6–6.5 and notably tough; photo alone cannot distinguish them or establish crystal structure.
Formation & geological history
If serpentine, formed by hydration and alteration of ultramafic rocks; if nephrite, formed by metamorphic or metasomatic alteration. Such rocks range from ancient to geologically recent.
Uses & applications
Tumbled stones are used for collecting, decoration, and jewelry; verified jade may have higher jewelry value.
Geological facts
The rounded shape and polish indicate tumbling or other human finishing, which does not make it non-geological.
Field identification & locations
A definitive identification requires tests such as hardness, specific gravity, and refractive index; avoid scratch testing a valued piece. Serpentine and nephrite occur in many metamorphic belts worldwide.
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