metamorphic
Polished serpentine pendant
Serpentinite, chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and carbonate
AI-generated identification · may be incorrectUsually green, blue-green, gray, and yellow-brown with mottled or veined patterns; waxy to greasy luster; Mohs hardness 2.5–4; fine-grained, massive texture with no obvious cleavage; specific gravity about 2.5–2.6. The pictured piece is polished and wire-wrapped.
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Physical properties
Usually green, blue-green, gray, and yellow-brown with mottled or veined patterns; waxy to greasy luster; Mohs hardness 2.5–4; fine-grained, massive texture with no obvious cleavage; specific gravity about 2.5–2.6. The pictured piece is polished and wire-wrapped.
Formation & geological history
Forms when ultramafic mantle rocks, especially peridotite, are hydrated during low-temperature metamorphism near faults and subduction zones. Serpentinite ranges from Precambrian to modern tectonic settings and commonly occurs in ophiolites.
Uses & applications
Used as ornamental stone, carvings, tabletops, and jewelry; historically used for architectural objects. Avoid cutting or grinding unknown material because some serpentinite may contain fibrous chrysotile asbestos.
Geological facts
Its green coloration comes from serpentine minerals, while dark patches may contain magnetite or chromite. It can resemble nephrite jade, but is generally softer and less tough.
Field identification & locations
Identify by its soft, waxy feel, mottled green coloration, low hardness, and association with ultramafic rocks; it may be scratched by a steel knife. Common localities include California, Italy, New Zealand, Canada, and the Alps.
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