sedimentary
Fine-grained gray-green pebble
Likely lithic sandstone or siltstone; exact identification is not possible from the image alone
AI-generated identification · may be incorrectRounded, matte gray-green surface with tiny visible grains; likely Mohs hardness about 3–7 depending on cement and composition. No obvious crystals or cleavage; probable quartz and rock fragments in a fine-grained matrix.
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Physical properties
Rounded, matte gray-green surface with tiny visible grains; likely Mohs hardness about 3–7 depending on cement and composition. No obvious crystals or cleavage; probable quartz and rock fragments in a fine-grained matrix.
Formation & geological history
Probably a water-worn sedimentary pebble, rounded by abrasion in a stream or along a beach. Its age and precise formation environment cannot be determined from appearance alone.
Uses & applications
Primarily a natural or collected pebble; similar sandstone and siltstone are used as building stone and aggregate.
Geological facts
The smooth outline indicates prolonged abrasion, while the fine, speckled texture suggests grains cemented together rather than a single large crystal.
Field identification & locations
Look for gritty grains, layered surfaces, and whether it scratches glass; these can help distinguish sandstone from softer siltstone. Such pebbles occur in river gravels and beaches worldwide.
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