metamorphic
Tumbled serpentine-rich stone
Serpentinite, likely with yellow limonite/goethite or epidote alteration
AI-generated identification · may be incorrectOlive-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.
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Physical properties
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.
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.
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