metamorphic
Greenstone / serpentinite carving
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing
AI-generated identification · may be incorrectDark blue-green, fine-grained, matte to weakly waxy luster, and smoothly polished/carved. Serpentine has Mohs hardness about 2.5–4, no obvious cleavage, and commonly a massive structure; the rounded form is human-made.
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Physical properties
Dark blue-green, fine-grained, matte to weakly waxy luster, and smoothly polished/carved. Serpentine has Mohs hardness about 2.5–4, no obvious cleavage, and commonly a massive structure; the rounded form is human-made.
Formation & geological history
Serpentinite forms when ultramafic mantle rocks, especially peridotite, are hydrated during metamorphism; ages vary widely from Precambrian to modern tectonic zones. This specimen is a shaped decorative object rather than a natural rock form.
Uses & applications
Used for carvings, ornaments, countertops, and architectural stone; attractive green varieties may be sold as serpentine jade, though they are not true jadeite or nephrite. Common carved pieces generally have modest value.
Geological facts
The blue-green color may also indicate soapstone or another greenstone, and appearance alone cannot distinguish them reliably. Acid reaction, hardness, streak, density, and microscopic examination would improve identification.
Field identification & locations
Common sources include California, Oregon, Washington, New Zealand, Italy, Canada, and tectonic belts worldwide. Typical value is about $10–$50 for a small polished carving, or $50–$150 if unusually fine, authenticated, or artistically significant.
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