metamorphic
Tumbled green-yellow stone, likely serpentine or nephrite jade
Serpentine-group mineral aggregate, commonly lizardite/antigorite; possible nephrite (interlocking tremolite-actinolite)
AI-generated identification · may be incorrectOpaque olive-green to yellow, fine-grained, waxy to greasy luster, rounded and polished; estimated Mohs hardness 3–6 depending on composition. No visible crystals or cleavage; apparent density is moderate to high.
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Physical properties
Opaque olive-green to yellow, fine-grained, waxy to greasy luster, rounded and polished; estimated Mohs hardness 3–6 depending on composition. No visible crystals or cleavage; apparent density is moderate to high.
Formation & geological history
Serpentine forms when ultramafic mantle rocks hydrate during metamorphism, commonly in oceanic crust and subduction zones; nephrite forms by metamorphic alteration of magnesium-rich rocks. Exact age and identity require testing.
Uses & applications
Used as a decorative carving stone, lapidary material, ornamental pebble, and occasionally jewelry; true nephrite has greater commercial value than common serpentine.
Geological facts
The image alone cannot reliably distinguish serpentine from jade, dyed stone, or another green rock. A refractive index, specific-gravity, hardness, and microscopic examination would improve identification.
Field identification & locations
Look for mottled green color, waxy polish, and absence of obvious grains; serpentine is typically softer and scratches with a steel blade, while nephrite resists scratching and feels notably tough. Common sources include California, New Zealand, Canada, Russia, China, and Central Asia.
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