metamorphic
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
AI-generated identification · may be incorrectTypically green, yellow-brown, and black with mottled or veined patterns; waxy to greasy luster and commonly rounded from polishing. Mohs hardness is about 2.5–4, with poor cleavage and variable density around 2.5–2.6 g/cm³.
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Physical properties
Typically green, yellow-brown, and black with mottled or veined patterns; waxy to greasy luster and commonly rounded from polishing. Mohs hardness is about 2.5–4, with poor cleavage and variable density around 2.5–2.6 g/cm³.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and low-temperature metamorphism, often along tectonic plate boundaries; many examples formed during the Paleozoic to Cenozoic.
Uses & applications
Used as decorative stone, ornamental objects, carvings, countertops, and lapidary material; attractive polished pieces have modest collector value.
Geological facts
Serpentine is a mineral group rather than one single mineral, and some serpentinite contains fibrous chrysotile asbestos. The pictured pebble appears polished or naturally water-worn.
Field identification & locations
Identify by its smooth waxy feel, low hardness, green-to-brown mottling, and tendency to scratch with a steel knife; common localities include California, Italy, New Zealand, Canada, and the Appalachian region.
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