sedimentary
Pebble
River Pebble / Gravel
Hardness 6-7 (typically quartz-rich), greyish to brown color, smooth rounded texture from erosion, vitreous to dull luster.
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Physical properties
Hardness 6-7 (typically quartz-rich), greyish to brown color, smooth rounded texture from erosion, vitreous to dull luster.
Formation & geological history
Formed by the weathering, erosion, and transport of rock fragments by river or stream action over long periods.
Uses & applications
Landscaping, aggregate in construction, decorative crafts, tumbling and polishing.
Geological facts
Smooth pebble shapes are produced through a process called attrition, where rocks collide with each other in water currents.
Field identification & locations
Identify by rounded, smooth surfaces without sharp edges. Extremely common near stream beds, riverbanks, and beaches worldwide.
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