metamorphic
Serpentinite (probable)
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relic olivine/pyroxene
AI-generated identification · may be incorrectGreenish-gray, mottled, and generally dull to waxy with a fine-grained, massive texture; serpentine hardness is about 2.5–4 Mohs, with poor or indistinct cleavage and specific gravity around 2.5–2.6. The image is not detailed enough for a definitive identification.
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Physical properties
Greenish-gray, mottled, and generally dull to waxy with a fine-grained, massive texture; serpentine hardness is about 2.5–4 Mohs, with poor or indistinct cleavage and specific gravity around 2.5–2.6. The image is not detailed enough for a definitive identification.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during low-temperature metamorphism, commonly along oceanic crust and tectonic plate boundaries; ages range from modern alteration to Precambrian. Associated minerals may include talc, carbonate, and magnetite.
Uses & applications
Used as decorative stone, carvings, countertops, and historically as a source of asbestos-bearing material; attractive polished pieces may be sold as ornamental stone.
Geological facts
Serpentinite often has a characteristic slick or waxy surface and may contain dark magnetite grains. Chrysotile-bearing varieties can pose a health hazard if cut or powdered.
Field identification & locations
Look for mottled green coloration, waxy feel, low hardness, and possible magnetism; a streak, hardness, acid, and thin-section test would improve confidence. Common in California, the Appalachians, the Alps, New Zealand, and ophiolite belts.
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