metamorphic
Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist
Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc
AI-generated identification · may be incorrectDark gray-green, fine-grained, weakly foliated, with a pale mineral vein; typically Mohs 2.5–4, dull to waxy luster, nonmetallic, and dense. Exact identification requires hardness, streak, magnetism, and acid testing.
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Physical properties
Dark gray-green, fine-grained, weakly foliated, with a pale mineral vein; typically Mohs 2.5–4, dull to waxy luster, nonmetallic, and dense. Exact identification requires hardness, streak, magnetism, and acid testing.
Formation & geological history
Produced when mantle-derived peridotite is hydrated and metamorphosed, commonly along tectonic plate boundaries and ophiolite belts; formation may range from Paleozoic to modern tectonic settings.
Uses & applications
Used as decorative stone, carvings, countertops, aggregate, and lapidary material; attractive polished pieces may have modest collector value.
Geological facts
Serpentinite often contains fibrous minerals related to chrysotile and may weather to a characteristic green, slick surface. The light vein could be calcite, quartz, or chrysotile, requiring testing.
Field identification & locations
Likely serpentinite if it feels unusually soft, has a waxy surface, and scratches with a steel blade; chlorite schist is more likely if visibly foliated and harder. Common in California, the Appalachians, the Alps, New Zealand, and ophiolite complexes worldwide.
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