metamorphic
Tumbled serpentine-rich stone
Serpentinite, commonly dominated by antigorite, lizardite, or chrysotile
AI-generated identification · may be incorrectPale greenish-gray, waxy to greasy luster, massive and fine-grained; typically Mohs 2.5–4, with poor or indistinct cleavage and specific gravity around 2.5–2.6. The rounded form appears water-worn or polished.
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Physical properties
Pale greenish-gray, waxy to greasy luster, massive and fine-grained; typically Mohs 2.5–4, with poor or indistinct cleavage and specific gravity around 2.5–2.6. The rounded form appears water-worn or polished.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and alteration, commonly along tectonic boundaries and seafloor environments. Serpentinite ranges from ancient Precambrian occurrences to geologically young active fault zones.
Uses & applications
Used as decorative stone, carvings, lapidary material, and occasionally architectural facing; fibrous chrysotile-bearing material has historical asbestos applications but should not be cut, drilled, or powdered without testing.
Geological facts
Serpentine is a mineral-group name, while serpentinite is the rock. Its green color results from hydrated magnesium silicate minerals, sometimes with magnetite or carbonate veins.
Field identification & locations
Identify by its low hardness, smooth waxy feel, green-gray color, and tendency to scratch with a steel knife; it generally does not fizz with dilute hydrochloric acid unless carbonate is present. Common sources include California, Italy, Canada, New Zealand, and the Ural Mountains.
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