metamorphic
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)
AI-generated identification · may be incorrectGreen to yellow-green, mottled and fine-grained with a waxy to dull luster; Mohs hardness about 2.5–4, generally massive with no obvious cleavage. The rounded surface suggests a naturally weathered or tumbled fragment.
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Physical properties
Green to yellow-green, mottled and fine-grained with a waxy to dull luster; Mohs hardness about 2.5–4, generally massive with no obvious cleavage. The rounded surface suggests a naturally weathered or tumbled fragment.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during low-temperature metamorphism, commonly along tectonic plate boundaries and ophiolites. Its age varies widely by locality, from Precambrian to modern tectonic zones.
Uses & applications
Used as decorative stone, carvings, aggregate, and historically as a source rock for asbestos-bearing minerals; attractive pieces may be collected, though fibrous material should not be cut or powdered.
Geological facts
Serpentinite’s green coloration results from serpentinization and associated magnetite formation. It can resemble greenstone, jade, or altered volcanic rock.
Field identification & locations
Look for a greasy or waxy feel, mottled green color, low hardness, and occasional dark magnetite specks; definitive identification may require microscopy or X-ray analysis. Common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide.
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