metamorphic
Tumbled yellow-green stone, likely serpentine
Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)
AI-generated identification · may be incorrectTypically Mohs 2.5–4, waxy to greasy luster, pale yellow-green mottled color, opaque, and massive rather than visibly crystalline; the rounded shape indicates natural wear or tumbling. The image is not detailed enough for a definitive identification.
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Physical properties
Typically Mohs 2.5–4, waxy to greasy luster, pale yellow-green mottled color, opaque, and massive rather than visibly crystalline; the rounded shape indicates natural wear or tumbling. The image is not detailed enough for a definitive identification.
Formation & geological history
Serpentine forms when magnesium-rich ultramafic rocks, such as peridotite, undergo hydration during low-temperature metamorphism; these rocks commonly formed in ancient oceanic mantle and are later exposed in mountain belts.
Uses & applications
Used as ornamental stone, carvings, beads, and decorative objects; some varieties are sold as “new jade.” Avoid assuming it is jade without hardness and mineralogical testing.
Geological facts
Serpentine is softer and generally less dense than jade, and may show fibrous, scaly, or mottled textures. Chrysotile, a fibrous serpentine mineral, is asbestos-forming, though a solid polished pebble is not automatically hazardous.
Field identification & locations
Common in ultramafic-rock terrains, including California, Vermont, Italy, New Zealand, and Canada. Field clues include low hardness, waxy feel, green-yellow mottling, and possible white veinlets; a scratch test should be performed inconspicuously.
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