metamorphic
Tumbled serpentine
Serpentine-group minerals, commonly antigorite or lizardite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectPale green to yellow-green, waxy to slightly greasy luster, opaque to translucent, and smoothly tumbled. Hardness is typically 2.5–4 Mohs; it lacks obvious cleavage and has a specific gravity near 2.5–2.6.
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Physical properties
Pale green to yellow-green, waxy to slightly greasy luster, opaque to translucent, and smoothly tumbled. Hardness is typically 2.5–4 Mohs; it lacks obvious cleavage and has a specific gravity near 2.5–2.6.
Formation & geological history
Forms when ultramafic rocks such as peridotite undergo hydrothermal metamorphism and hydration, often in ancient oceanic crust and subduction zones. The specimen is a modern polished/tumbled piece; its geological age depends on its source rock.
Uses & applications
Used as an ornamental stone, carvings, beads, cabochons, and inexpensive curios; massive serpentine is also used decoratively in architecture. Avoid dust from cutting, as some serpentines may contain fibrous chrysotile asbestos.
Geological facts
The pale, cloudy appearance and rounded polish are consistent with common serpentine, though image-only identification is not definitive. It may be confused with jade, but serpentine is generally softer and less dense.
Field identification & locations
Commonly found in serpentinite belts in California, Vermont, Canada, New Zealand, Italy, and many other tectonic regions. Field clues include a soft, waxy feel, green coloration, low hardness, and association with dark ultramafic rock.
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