metamorphic

Likely serpentine-rich pebble

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

AI-generated identification · may be incorrect

Small, rounded, yellow-green pebble with mottled darker green patches and a dull to slightly waxy surface. Serpentine minerals have Mohs hardness about 2.5–5.5; the image does not show enough detail to confirm composition or crystal structure.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Serpentinite forms when water alters magnesium-rich ultramafic rock, commonly during seafloor alteration or metamorphism along tectonic boundaries. The pebble’s geological age and source cannot be determined from the image.

Uses & applications

Serpentinite is used as decorative stone, carving material, and sometimes as a low-grade building stone; this specimen is mainly suitable for collecting.

Geological facts

Green color and waxy appearance are common in serpentine-rich rocks, but other minerals and altered rocks can look similar.

Field identification & locations

Look for a smooth, often waxy feel, green mottling, and relatively low hardness; a scratch test or mineralogical analysis would help confirm identification. Serpentinite occurs in ancient mountain belts and ophiolite complexes worldwide.