metamorphic

Yellow-green serpentine pebble

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Typically Mohs 2.5–4, waxy to greasy luster, mottled yellow-green/gray color, and massive rather than visibly crystalline; specific gravity about 2.5–2.6. The rounded shape indicates natural or human tumbling/weathering.

Identified September 3, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks, such as peridotite, are hydrated during low-temperature metamorphism, commonly in oceanic crust and subduction zones. Serpentinization occurs from the Precambrian to the present.

Uses & applications

Used as decorative stone, carvings, countertops, and occasionally jewelry; fibrous chrysotile varieties were historically used as asbestos, though they are hazardous when disturbed. A small common pebble has little commercial value.

Geological facts

The yellow coloration may reflect iron-bearing serpentine or weathering products such as limonite. Serpentinite can resemble jade, but it is generally softer and less dense.

Field identification & locations

Look for a waxy feel, low hardness, green-yellow mottling, and lack of obvious cleavage or crystals; it may scratch with a steel knife. Common sources include California, Italy, New Zealand, Canada, and tectonic serpentinite belts worldwide.