sedimentary
River Pebble
Water-worn lithic fragment
Hardness varies (typically 6-7 on Mohs scale depending on mineral makeup, such as quartz), color ranges from gray to brown, dull luster, smooth and rounded crystal structure due to abrasion, no distinct cleavage.
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Physical properties
Hardness varies (typically 6-7 on Mohs scale depending on mineral makeup, such as quartz), color ranges from gray to brown, dull luster, smooth and rounded crystal structure due to abrasion, no distinct cleavage.
Formation & geological history
Formed through the mechanical weathering and erosion of parent rocks, transported and rounded by water action in rivers or streams over thousands to millions of years.
Uses & applications
Used in landscaping, gardening, decorative pathways, and aquariums.
Geological facts
The smooth shape of river pebbles is the result of thousands of hours of tumbling against other rocks in fast-moving water.
Field identification & locations
Found abundantly in riverbeds, lake shores, and beaches worldwide. Identified by its smooth, water-worn surface.
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