metamorphic
Likely serpentinite pebble
Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the image is uncertain
AI-generated identification · may be incorrectGreen to dark green with mottled purple-brown patches and a dull, slightly waxy surface; serpentine minerals are Mohs 2.5–5.5, but hardness, cleavage, and crystal structure cannot be confirmed visually.
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Physical properties
Green to dark green with mottled purple-brown patches and a dull, slightly waxy surface; serpentine minerals are Mohs 2.5–5.5, but hardness, cleavage, and crystal structure cannot be confirmed visually.
Formation & geological history
Forms when water alters ultramafic rocks, commonly along tectonic plate boundaries and in ancient oceanic crust; the specimen’s age and source cannot be determined from the image.
Uses & applications
Serpentinite is used as decorative stone, carvings, and sometimes in construction; this small pebble is mainly suitable for collecting.
Geological facts
Serpentinite often has a mottled or veined green appearance and may contain magnetite or other minerals that create dark patches.
Field identification & locations
Look for a green, commonly waxy-looking rock with mottling or veins; compare hardness and streak before confirming, since several green rocks resemble it. Serpentinite occurs worldwide in mountain belts and ophiolite complexes.
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