sedimentary
Pebble
Lithic fragment
AI-generated identification · may be incorrectHardness varies between 6 and 7 on the Mohs scale depending on mineral composition. Colors range widely from gray, brown, and black to red and white with a dull to sub-vitreous luster.
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Physical properties
Hardness varies between 6 and 7 on the Mohs scale depending on mineral composition. Colors range widely from gray, brown, and black to red and white with a dull to sub-vitreous luster.
Formation & geological history
Formed through the mechanical weathering, erosion, and water-transport smoothing of larger parent rocks over thousands to millions of years.
Uses & applications
Used primarily in landscaping, decorative ground cover, and concrete aggregate production.
Geological facts
Pebbles are officially classified by geologists based on their particle size, typically measuring between 4 and 64 millimeters in diameter. Water-worn pebbles are frequently found in riverbeds and ancient sedimentary deposits.
Field identification & locations
Identify in the field by its smooth, rounded edges resulting from fluvial or coastal abrasion. Common worldwide along riverbanks, lakeshores, and beaches.
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