metamorphic

Polished serpentine pebble

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, chrysotile)

AI-generated identification · may be incorrect

Smooth, rounded, mottled olive-green and brown with a dull-to-waxy luster; serpentine minerals have Mohs hardness about 2.5–5.5 and typically form fine-grained, massive textures. The image does not show enough detail to confirm the identification or assess cleavage and density.

Identified September 26, 2026More metamorphic →

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Physical properties

Formation & geological history

Serpentinite forms when water alters ultramafic rocks, commonly along tectonic plate boundaries; this pebble’s geological age and source cannot be determined from the image.

Uses & applications

Polished serpentine is used for ornamental objects, carvings, beads, and decorative stone; this small pebble is mainly a keepsake or craft material.

Geological facts

Serpentinite is named for its often mottled, scale-like appearance. Some varieties contain asbestos-form chrysotile, so avoid cutting or grinding unidentified material and creating dust.

Field identification & locations

The rounded shape and smooth surface suggest natural water-wear followed by polishing. Serpentinite occurs in many mountain belts and subduction-related zones; confirm with hardness, streak, and mineral testing.