sedimentary
Pebble
Lithic fragment / Weathered rock fragment
Hardness varies depending on parent rock (typically 6-7 on Mohs scale if quartz-rich); Color is greyish-green; Luster is dull to earthy; Structure is rounded and water-worn; Specific gravity around 2.6-2.7
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Physical properties
Hardness varies depending on parent rock (typically 6-7 on Mohs scale if quartz-rich); Color is greyish-green; Luster is dull to earthy; Structure is rounded and water-worn; Specific gravity around 2.6-2.7
Formation & geological history
Formed by the weathering, erosion, and mechanical abrasion of larger rocks, typically smoothed and rounded over long distances by water transport in rivers, streams, or wave action on beaches.
Uses & applications
Used in landscaping, decorative ground cover, construction aggregate, and garden pathways.
Geological facts
Pebbles are officially classified by geologists based on size, specifically particles ranging from 4 to 64 millimeters in diameter.
Field identification & locations
Commonly found in riverbeds, lake shores, and beaches worldwide. Identification relies on observing smooth, rounded edges shaped by natural tumbling.
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