metamorphic

Tumbled serpentine-rich stone

Serpentinite, likely with yellow limonite/goethite or epidote alteration

AI-generated identification · may be incorrect

Olive-green to yellow, opaque, waxy to subvitreous luster, fine-grained and polished; serpentine hardness is about Mohs 2.5–4, with no visible cleavage. The mottled yellow areas may be iron oxides or epidote, and specific gravity is roughly 2.5–2.7.

Identified August 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Serpentinite forms when ultramafic mantle rocks such as peridotite are hydrated during metamorphism, commonly along tectonic plate boundaries; its geological age depends on the source locality. Yellow-brown zones result from weathering and iron-rich alteration.

Uses & applications

Used as a decorative carving and lapidary stone, including tumbled stones, beads, cabochons, and ornamental objects; massive serpentinite is also used locally as facing stone. This small polished specimen generally has modest commercial value.

Geological facts

Its green color commonly comes from serpentine-group minerals such as antigorite, lizardite, or chrysotile. Serpentinite can resemble jade, but it is much softer and typically scratches more easily.

Field identification & locations

Identify by its greasy or waxy feel, green mottling, low hardness, and lack of strong crystal faces; a steel knife may scratch it. Common sources include California, Italy, New Zealand, Canada, and the Ural Mountains.