metamorphic
Likely green serpentine or chlorite-rich rock
Serpentine-group minerals, commonly lizardite/magnesite-bearing serpentinite; exact identification requires testing
AI-generated identification · may be incorrectHardness typically 2.5–4 Mohs, mottled olive to yellow-green color, waxy to greasy luster, massive rather than visibly crystalline, and generally poor cleavage. The specimen appears rough and green-black, but the image is insufficient for confident mineral identification.
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Physical properties
Hardness typically 2.5–4 Mohs, mottled olive to yellow-green color, waxy to greasy luster, massive rather than visibly crystalline, and generally poor cleavage. The specimen appears rough and green-black, but the image is insufficient for confident mineral identification.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo low-temperature hydrothermal metamorphism and hydration, commonly during ocean-floor alteration or mountain-building; ages vary widely.
Uses & applications
Serpentinite is used as an ornamental and carving stone, sometimes as a source of magnesium and asbestos-free aggregate; attractive pieces may be sold as lapidary material.
Geological facts
Serpentine is not a single mineral but a group, mainly lizardite, antigorite, and chrysotile. Avoid cutting or abrading unknown serpentinite because some varieties can contain fibrous asbestos minerals.
Field identification & locations
Common in ophiolites and tectonic mélanges, including California, Italy, New Zealand, Canada, and the Urals. A waxy feel, low hardness, green mottling, and a pale streak help distinguish it from harder green minerals such as jade.
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