metamorphic
Polished white-green serpentine pebble
Serpentine-group minerals, chiefly antigorite or lizardite; commonly sold as “new jade”
AI-generated identification · may be incorrectSmooth tumbled oval with pale mint-green color and waxy to silky luster. Serpentine has Mohs hardness about 2.5–4, variable cleavage, fine-grained massive structure, and specific gravity around 2.5–2.6; the photograph cannot confirm exact mineral identity.
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Physical properties
Smooth tumbled oval with pale mint-green color and waxy to silky luster. Serpentine has Mohs hardness about 2.5–4, variable cleavage, fine-grained massive structure, and specific gravity around 2.5–2.6; the photograph cannot confirm exact mineral identity.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly in ophiolite belts and subduction zones. Serpentinization ranges from ancient Precambrian terrains to modern tectonic environments.
Uses & applications
Used for ornamental carvings, beads, countertops, and inexpensive jewelry; polished pieces are commonly marketed as green serpentine or new jade. Typical tumbled specimens are worth about $2–$15, with larger or patterned carvings reaching $20–$100.
Geological facts
Its pale color and uniform texture can resemble jade, but true jadeite or nephrite is generally tougher and commonly more expensive. Serpentine may contain minor magnetite, chromite, talc, or asbestos-form minerals.
Field identification & locations
Common sources include California, Vermont, Italy, New Zealand, China, Afghanistan, and Canada. Field identification favors low hardness, waxy feel, green streak or powder, and reaction-free behavior with dilute acid; avoid cutting dusty material because some serpentines may contain fibrous chrysotile asbestos.
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