sedimentary
River Stone (River Pebble)
Rounded Sedimentary Rock (Lithic Clast)
Hardness: 6-7 (Mohs scale), Color: Brown, grey, and tan, Luster: Dull to earthy, Structure: Rounded/ellipsoid due to abrasion, Cleavage: None
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Brown, grey, and tan, Luster: Dull to earthy, Structure: Rounded/ellipsoid due to abrasion, Cleavage: None
Formation & geological history
Formed through the erosion and weathering of larger rock formations, transported by water over long periods which smoothens the edges into a rounded shape. Typical of fluvial environments.
Uses & applications
Used in landscaping, construction (aggregate), decorative garden paths, and as decorative aquarium stones.
Geological facts
River stones get their smooth texture from a process called saltation, where rocks bounce along the riverbed, breaking off sharp edges over thousands of years.
Field identification & locations
Identified by its smooth, water-worn surface and rounded shape. Commonly found in riverbeds, streams, and coastal beaches. Collectors look for unique colors or bands.
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