metamorphic
Tumbled serpentine (likely)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectMohs hardness typically 2.5–4; waxy to greasy luster, rounded from tumbling, pale olive-green to yellow-green with cloudy veining. Usually massive and noncrystalline, with poor cleavage; specific gravity about 2.5–2.6.
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Physical properties
Mohs hardness typically 2.5–4; waxy to greasy luster, rounded from tumbling, pale olive-green to yellow-green with cloudy veining. Usually massive and noncrystalline, with poor cleavage; specific gravity about 2.5–2.6.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during hydrothermal alteration, commonly in subduction zones and oceanic crust; ages vary widely. The smooth surface indicates human tumbling or polishing.
Uses & applications
Used as ornamental stone, carvings, beads, and decorative tile; softer varieties are mainly collector pieces. Avoid dust from cutting because some serpentinite can contain fibrous chrysotile asbestos.
Geological facts
Its mottled green color and waxy appearance are characteristic, but the photograph alone cannot distinguish it confidently from greenstone, nephrite, or altered soapstone.
Field identification & locations
Common localities include California, Italy, New Zealand, Canada, and the Ural Mountains. Field checks include low hardness, waxy feel, pale streak, and possible reaction or alteration textures; definitive identification requires microscopy or chemical testing.
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