metamorphic
Tumbled greenish pebble, possibly serpentine
Indeterminate green metamorphic rock; serpentine-group minerals are a plausible match
AI-generated identification · may be incorrectSmall, smooth, rounded pebble with muted green-gray color and a dull to slightly waxy luster. Hardness and exact composition cannot be reliably determined from the photograph; serpentine is typically Mohs 2.5–5, with a massive rather than visibly crystalline texture.
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Physical properties
Small, smooth, rounded pebble with muted green-gray color and a dull to slightly waxy luster. Hardness and exact composition cannot be reliably determined from the photograph; serpentine is typically Mohs 2.5–5, with a massive rather than visibly crystalline texture.
Formation & geological history
The pebble appears water-worn or mechanically tumbled. Serpentine forms when magnesium-rich rocks are altered by hot, water-rich fluids; its age depends on the source rock and cannot be inferred from the image.
Uses & applications
Likely a decorative or collected pebble; serpentine is also used for carvings and ornamental stone, though this specimen’s identity is unconfirmed.
Geological facts
Green color alone is not diagnostic: several minerals and rocks, including serpentine, greenstone, and altered volcanic rocks, can look similar.
Field identification & locations
The reported southern California location makes serpentinite or other altered green rocks plausible, but the image does not show enough diagnostic detail to identify the pebble confidently. A scratch or hardness test and close inspection of a fresh surface would help; avoid acid tests unless carbonate is suspected.
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