metamorphic
Weathered greenish-gray rock fragment, likely serpentinite or chlorite-rich metamorphic rock
Tentative identification: serpentinite (serpentine-group minerals) or chlorite-bearing metamorphic rock; image alone cannot distinguish them reliably
AI-generated identification · may be incorrectOpaque, dull to weakly waxy, mottled olive-gray surface with irregular fracture; likely Mohs hardness about 2–5 depending on composition. Crystal structure and specific gravity cannot be determined from the photo.
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Physical properties
Opaque, dull to weakly waxy, mottled olive-gray surface with irregular fracture; likely Mohs hardness about 2–5 depending on composition. Crystal structure and specific gravity cannot be determined from the photo.
Formation & geological history
Such rocks form when magnesium-rich ultramafic rock is altered by water, or when chlorite-bearing rocks undergo low-grade metamorphism. Their ages vary widely with the host geology.
Uses & applications
Usually collected as a field specimen; serpentinite is sometimes used as decorative stone, while chlorite-rich rock has limited ornamental or industrial use.
Geological facts
The pale, uneven color and apparent fine-grained texture are compatible with several common metamorphic rocks, so a confident species-level identification requires tests or locality information.
Field identification & locations
Check for a smooth, slightly soapy feel and pale green streak (serpentinite); a steel nail scratch and a fresh surface can help narrow the identification. Serpentinite occurs in altered ultramafic belts worldwide.
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