metamorphic
Tumbled green stone, possibly serpentine
Likely serpentine-group rock (mainly serpentine minerals; identification uncertain from the image)
AI-generated identification · may be incorrectOpaque blue-green to dark green, smooth and rounded with faint pale bands; surface appears polished with a waxy luster. Serpentine has Mohs hardness about 2.5–5.5 and a typically fine-grained structure; exact properties depend on composition.
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Physical properties
Opaque blue-green to dark green, smooth and rounded with faint pale bands; surface appears polished with a waxy luster. Serpentine has Mohs hardness about 2.5–5.5 and a typically fine-grained structure; exact properties depend on composition.
Formation & geological history
Serpentine forms when water alters magnesium-rich rocks, commonly in ancient oceanic crust and mantle-derived rocks; such alteration spans many geological ages.
Uses & applications
Commonly tumbled for collecting, crafts, and decorative pieces; serpentine is also used as ornamental stone and, in some varieties, carved objects.
Geological facts
The rounded shape and polish indicate human tumbling, which can enhance natural color and banding.
Field identification & locations
A photo cannot confirm the mineral; check hardness, streak, and translucency, or seek a gem/mineral identification. Serpentine is found in ultramafic-rock belts worldwide, including California, Italy, and New Zealand.
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