metamorphic
Serpentine (likely polished serpentinite)
Serpentinite; chiefly antigorite, lizardite, and/or chrysotile, Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectTypically olive-green to black, waxy or greasy luster, Mohs hardness about 2.5–4, and commonly massive with fibrous or platy textures; the cut piece shows green banding and pale veining. Specific gravity is approximately 2.5–2.6; cleavage is generally poor to indistinct.
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Physical properties
Typically olive-green to black, waxy or greasy luster, Mohs hardness about 2.5–4, and commonly massive with fibrous or platy textures; the cut piece shows green banding and pale veining. Specific gravity is approximately 2.5–2.6; cleavage is generally poor to indistinct.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo low-temperature hydrothermal metamorphism and hydration. It occurs from Precambrian to modern tectonic settings, especially ophiolites and subduction zones.
Uses & applications
Used as decorative stone, carvings, cabochons, countertops, and ornamental tiles; historically used for tools and architectural objects. Chrysotile-rich material may contain asbestos and should not be cut or abraded without testing and protection.
Geological facts
The specimen’s green color, waxy appearance, and translucent pale veins strongly suggest serpentine, though image-only identification is not definitive; similar green calcite or bowenite are possible.
Field identification & locations
Common in California, Italy, New Zealand, Canada, Afghanistan, and ophiolite belts worldwide. Check for low hardness, waxy feel, green streaking, and reaction behavior; avoid acid or dust tests unless appropriate safety precautions are used.
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