mineral
Tumbled serpentine (likely bowenite)
Serpentine-group magnesium silicate; commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)
AI-generated identification · may be incorrectPale green to cream, waxy to subvitreous luster, with fibrous or mottled streaks and no visible crystal faces; Mohs hardness about 2.5–4, specific gravity 2.5–2.6. The rounded shape indicates tumbling or polishing.
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Physical properties
Pale green to cream, waxy to subvitreous luster, with fibrous or mottled streaks and no visible crystal faces; Mohs hardness about 2.5–4, specific gravity 2.5–2.6. The rounded shape indicates tumbling or polishing.
Formation & geological history
Forms when magnesium-rich ultramafic rocks, especially peridotite, undergo hydrothermal alteration; most examples are Paleozoic or younger, though serpentinization can occur at any age.
Uses & applications
Used as carving stone, ornamental objects, beads, and occasionally decorative facing stone; attractive translucent bowenite varieties are collected and used in jewelry.
Geological facts
Serpentine is a mineral group rather than one single mineral. Some fibrous chrysotile serpentine is asbestos-forming, but a polished piece should not be cut, drilled, or powdered without confirming its identity.
Field identification & locations
Likely serpentine based on its pale green color, waxy surface, and fibrous-looking pattern; distinguish it from jade by its lower hardness and softer feel. Common sources include California, New Zealand, Italy, Canada, and Afghanistan.
