sedimentary
River Pebble
Lithified clastic sediment
Hardness varies (typically 6-7 on Mohs scale if quartz-rich), green to brown color, vitreous to dull luster, amorphous or cryptocrystalline structure, no distinct cleavage, specific gravity around 2.6-2.7
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Physical properties
Hardness varies (typically 6-7 on Mohs scale if quartz-rich), green to brown color, vitreous to dull luster, amorphous or cryptocrystalline structure, no distinct cleavage, specific gravity around 2.6-2.7
Formation & geological history
Formed through the mechanical weathering, transportation, and water-driven tumbling of larger rock masses in river beds or lake shores over thousands to millions of years
Uses & applications
Used in landscaping, decorative pathways, gardening, and sometimes as raw material for aggregate or lapidary practice
Geological facts
Water-rounded pebbles like this undergo abrasion in energetic aquatic environments, smoothing off sharp edges and revealing the interior mineral grains
Field identification & locations
Commonly found along riverbanks, lake shores, and beaches worldwide; identified by its smooth, water-worn shape and lack of sharp fractures
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