metamorphic
Polished green serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite and/or lizardite; bowenite is a compact, nickel-bearing serpentine variety
AI-generated identification · may be incorrectTypically pale to dark green with fibrous or banded veining, waxy to greasy luster, and smooth polish; Mohs hardness 2.5–4, monoclinic/triclinic crystal structure, poor cleavage, and specific gravity about 2.5–2.6. The rounded shape is human-polished and the specimen may also resemble green nephrite or soapstone.
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Physical properties
Typically pale to dark green with fibrous or banded veining, waxy to greasy luster, and smooth polish; Mohs hardness 2.5–4, monoclinic/triclinic crystal structure, poor cleavage, and specific gravity about 2.5–2.6. The rounded shape is human-polished and the specimen may also resemble green nephrite or soapstone.
Formation & geological history
Forms when ultramafic rocks such as peridotite undergo hydrothermal alteration and hydration, commonly during oceanic-crust or mountain-building processes; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used for ornamental carvings, beads, cabochons, decorative stone, and occasionally countertops; high-quality translucent bowenite is collectible but generally less valuable than jade.
Geological facts
Serpentine can show asbestos-form minerals, so avoid cutting, drilling, or generating dust unless its composition is confirmed. It is commonly confused with jade because of its green color and polish.
Field identification & locations
Common in California, Vermont, New Zealand, Italy, Russia, Canada, and Afghanistan; field clues include low hardness, waxy feel, green veining, and scratching by steel. Definitive separation from jade requires hardness, density, microscopy, or laboratory testing.
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