metamorphic
Tumbled green-and-white stone, likely serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins
AI-generated identification · may be incorrectTypically Mohs 2.5–4, dark green to gray-green with white veining, waxy to slightly greasy luster, and no obvious cleavage; massive, fine-grained texture. The rounded, polished surface is consistent with a tumbled specimen.
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Physical properties
Typically Mohs 2.5–4, dark green to gray-green with white veining, waxy to slightly greasy luster, and no obvious cleavage; massive, fine-grained texture. The rounded, polished surface is consistent with a tumbled specimen.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrated during tectonic alteration, commonly in oceanic crust and subduction zones. Serpentinite formation spans much of geologic time, including modern seafloor environments.
Uses & applications
Used as decorative stone, carvings, beads, countertops, and teaching specimens; attractive varieties may be sold as “serpentine jade,” though they are not true jade.
Geological facts
Often has a mottled or veined green appearance and may feel unusually smooth or soapy. Fibrous chrysotile-bearing material should not be cut, drilled, or powdered because asbestos fibers may be present.
Field identification & locations
Common in California, Italy, New Zealand, Canada, and tectonic mountain belts worldwide. Confirm with a hardness test, streak, density, and ideally Raman/XRD analysis; the image alone cannot exclude nephrite, chlorite schist, or another green metamorphic rock.
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