metamorphic
Tumbled green stone, likely serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite, a jade variety of tremolite–actinolite
AI-generated identification · may be incorrectOpaque pale green with dark mottling and a smooth, rounded polish; likely Mohs 3–6 depending on identification, with waxy to vitreous luster and no visible cleavage. The blurred image prevents confident separation of serpentine from jade or other greenstone.
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Physical properties
Opaque pale green with dark mottling and a smooth, rounded polish; likely Mohs 3–6 depending on identification, with waxy to vitreous luster and no visible cleavage. The blurred image prevents confident separation of serpentine from jade or other greenstone.
Formation & geological history
Serpentine forms when ultramafic rocks are hydrated during metamorphism; nephrite forms through metamorphic alteration involving tremolite–actinolite. These materials are generally Paleozoic to younger, depending on locality.
Uses & applications
Used as ornamental tumbled stone, carvings, beads, and decorative objects; true nephrite jade can be used in jewelry and valued substantially more than common serpentine.
Geological facts
Dark veins or patches may be magnetite, chromite, or other inclusions. A compact, fibrous texture and toughness favor nephrite; a softer, waxier feel favors serpentine.
Field identification & locations
Commonly found in serpentinite belts, including California, New Zealand, Canada, Russia, China, and Pakistan. Test cautiously: serpentine scratches with a steel blade, while nephrite generally resists it; specific gravity and professional testing are more reliable.
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