metamorphic
Small green-gray pebble (likely serpentinite)
Serpentinite, composed mainly of serpentine-group minerals
AI-generated identification · may be incorrectSmooth, rounded, dull to slightly waxy green-gray surface; serpentinite is typically Mohs 3–5.5, with variable texture and no consistent visible crystal structure in this small, blurry specimen.
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Physical properties
Smooth, rounded, dull to slightly waxy green-gray surface; serpentinite is typically Mohs 3–5.5, with variable texture and no consistent visible crystal structure in this small, blurry specimen.
Formation & geological history
Serpentinite forms when water alters ultramafic rocks, commonly in ancient oceanic crust and subduction zones; the pebble’s age and precise origin cannot be determined from the image.
Uses & applications
Serpentinite is used as decorative or carving stone and, when suitable, as a polished ornamental material; this pebble appears to have little commercial value.
Geological facts
Green pebbles can also be other rocks or minerals, so color alone is not diagnostic.
Field identification & locations
The rounded shape suggests transport by water or abrasion. A close-up, hardness test, and examination of streak and texture would be needed to identify it confidently; serpentinite occurs worldwide in ultramafic-rock belts.
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