metamorphic
Polished serpentine-rich rock (probable serpentinite)
Serpentinite; chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and relict olivine/pyroxene
AI-generated identification · may be incorrectTypically olive-green, yellow-brown, or mottled, with waxy to subvitreous luster and smooth polished surface; Mohs hardness about 2.5–4, massive texture, and poor or indistinct cleavage. The specimen’s appearance is consistent with a rounded, polished serpentine rock, though an image alone cannot confirm identity.
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Physical properties
Typically olive-green, yellow-brown, or mottled, with waxy to subvitreous luster and smooth polished surface; Mohs hardness about 2.5–4, massive texture, and poor or indistinct cleavage. The specimen’s appearance is consistent with a rounded, polished serpentine rock, though an image alone cannot confirm identity.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly along faults and oceanic crust; many deposits formed during the Paleozoic–Mesozoic and younger tectonic events.
Uses & applications
Used as decorative stone, carvings, countertops, and lapidary material; softer varieties are popular for polished stones and sculptures.
Geological facts
Serpentinite often contains magnetite and may be weakly magnetic; some varieties can contain asbestos-form chrysotile, so avoid generating dust when cutting or sanding.
Field identification & locations
Look for green-brown mottling, waxy feel, low hardness, and occasional dark veins or magnetism; common in ophiolites and subduction-zone belts worldwide, including California, Italy, New Zealand, and the Appalachians.
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