sedimentary
Pebble
Lithic fragment
AI-generated identification · may be incorrectHardness varies between 6 and 7 on the Mohs scale depending on mineral content. Colors range from gray and brown to multicolored with a dull to subvitreous luster.
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Physical properties
Hardness varies between 6 and 7 on the Mohs scale depending on mineral content. Colors range from gray and brown to multicolored with a dull to subvitreous luster.
Formation & geological history
Formed through the mechanical weathering and water-transport erosion of larger parent rocks in riverbeds and marine environments.
Uses & applications
Used primarily in landscaping, concrete aggregate, pathway construction, and decorative gardening.
Geological facts
Pebbles are officially classified by the Udden-Wentworth scale as clasts with a particle size of 4 to 64 millimeters. Water-worn pebbles exhibit smooth rounded shapes due to prolonged abrasion.
Field identification & locations
Found abundantly in alluvial deposits, river banks, and beaches worldwide. Collectors identify them by their smooth rounded morphology and resistance to scratching.
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