metamorphic
Weathered greenish metamorphic rock, likely serpentinite
Serpentinite, dominated by serpentine-group minerals (commonly antigorite, lizardite, or chrysotile)
AI-generated identification · may be incorrectPale green-gray, mottled and earthy with a dull to slightly waxy luster; typically Mohs 2.5–4, fine-grained, with poor visible cleavage and variable density. The image is insufficient for a definitive identification; similar appearance can occur in altered ultramafic rocks.
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Physical properties
Pale green-gray, mottled and earthy with a dull to slightly waxy luster; typically Mohs 2.5–4, fine-grained, with poor visible cleavage and variable density. The image is insufficient for a definitive identification; similar appearance can occur in altered ultramafic rocks.
Formation & geological history
Forms when mantle-derived peridotite is hydrated and metamorphosed during tectonic activity, commonly in oceanic crust and subduction zones. Formation ages range from Precambrian to recent tectonic settings.
Uses & applications
Used as decorative stone, carvings, aggregate, and occasionally architectural facing; attractive varieties are collectible, though asbestos-bearing forms require caution when cutting or abrading.
Geological facts
Serpentinite often shows a characteristic green color from iron- and magnesium-rich serpentine minerals and may contain magnetite, chromite, talc, or asbestos minerals.
Field identification & locations
Look for green mottling, waxy feel, low hardness, and possible magnetism; a streak, hardness, specific-gravity, and asbestos-safe laboratory test would improve identification. Common regions include California, Italy, New Zealand, Canada, and the Appalachians.
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