metamorphic
Polished serpentine
Serpentinite; mainly antigorite, lizardite, and chrysotile-group minerals
AI-generated identification · may be incorrectTypically dark green to gray-green with mottled or veined patterns, waxy to greasy luster, and opaque to translucent edges. Mohs hardness is about 2.5–4; massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.
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Physical properties
Typically dark green to gray-green with mottled or veined patterns, waxy to greasy luster, and opaque to translucent edges. Mohs hardness is about 2.5–4; massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during metamorphism, commonly along tectonic plate boundaries and fault zones. Serpentinization ranges from ancient Precambrian to modern geological settings.
Uses & applications
Used as ornamental stone, carvings, cabochons, countertops, and landscaping material; attractive pieces have modest lapidary value. Chrysotile-bearing material should not be cut or abraded because inhaled fibers are hazardous.
Geological facts
The image appears to show a tumbled or polished green serpentine specimen, possibly with darker magnetite-rich or pyroxene-bearing patches. It can resemble jade, but is generally softer and less dense.
Field identification & locations
Common in serpentinite belts worldwide, including California, Italy, New Zealand, Canada, and the Ural Mountains. Field clues include a waxy green surface, low hardness, and a soapy feel; a steel knife may scratch it, unlike jade.
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