metamorphic

Small green-gray pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

AI-generated identification · may be incorrect

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.

Identified September 23, 2026More metamorphic →

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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.