sedimentary
Rounded greenish river pebble
Indeterminate; possibly weathered greenstone, basalt, or serpentinized ultramafic rock
AI-generated identification · may be incorrectFine-grained, dull earthy luster, olive-gray color, rounded by abrasion, and no visible crystals or cleavage. Estimated Mohs hardness 5–7; identification requires tests such as streak, magnetism, hardness, and density.
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Physical properties
Fine-grained, dull earthy luster, olive-gray color, rounded by abrasion, and no visible crystals or cleavage. Estimated Mohs hardness 5–7; identification requires tests such as streak, magnetism, hardness, and density.
Formation & geological history
Likely a naturally weathered and water-rounded cobble, potentially derived from volcanic or metamorphic bedrock; its geological age cannot be determined from the photograph.
Uses & applications
Primarily a natural curiosity, landscaping stone, or craft specimen; not identifiable as a gem-quality material from appearance alone.
Geological facts
The smooth shape and subdued surface reflect prolonged transport and abrasion, commonly in a stream, beach, or glacial deposit.
Field identification & locations
Commonly found in river gravel, shorelines, and glacial till. A fresh edge, gray-white streak, acid reaction, magnetism, and specific gravity would help distinguish basalt, greenstone, serpentine, and sedimentary rocks.
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