metamorphic
Polished serpentine (likely bowenite/“new jade”)
Serpentine-group minerals, chiefly antigorite and/or lizardite; commonly Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectHardness about 2.5–5.5 Mohs, typically olive to pale green with gray, cream, or brown veining; waxy to greasy luster and fine-grained, massive texture. The rounded polished surface obscures cleavage and crystal form; specific gravity is roughly 2.5–2.6.
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Physical properties
Hardness about 2.5–5.5 Mohs, typically olive to pale green with gray, cream, or brown veining; waxy to greasy luster and fine-grained, massive texture. The rounded polished surface obscures cleavage and crystal form; specific gravity is roughly 2.5–2.6.
Formation & geological history
Forms when ultramafic rocks such as peridotite hydrate during low-temperature metamorphism, commonly in ancient oceanic crust and subduction-zone mélanges. Serpentinization occurs from the Precambrian to the present.
Uses & applications
Used as an ornamental stone, carvings, cabochons, beads, and architectural facing; softer varieties are sold as “new jade.” It is generally unsuitable for high-wear jewelry.
Geological facts
The blue-green translucent patching and mottled olive coloration are consistent with polished serpentine, though visual identification is not definitive. Some serpentine varieties may contain chrysotile asbestos, so avoid cutting, drilling, or creating dust unless tested.
Field identification & locations
Common in serpentinite belts worldwide, including California, Italy, New Zealand, Canada, and the Urals. Field clues include unusually low hardness, greasy feel, green-black mottling, and association with dark ultramafic rock.
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