sedimentary
River Rock
N/A - General term for water-worn stones
AI-generated identification · may be incorrectHardness varies depending on the specific rock type. Color is typically tan, brown, or gray. Luster is dull to earthy. Often smooth and rounded due to water erosion.
Identified More sedimentary →
Explore River Rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies depending on the specific rock type. Color is typically tan, brown, or gray. Luster is dull to earthy. Often smooth and rounded due to water erosion.
Formation & geological history
Formed by the continuous action of water in a river or stream, which smooths and rounds the rough edges of rocks over time.
Uses & applications
Commonly used in landscaping, gardening, and decorative applications. Some are collected for their aesthetic appeal.
Geological facts
River rocks can be composed of various rock types, including sandstone, limestone, granite, or basalt, depending on the geology of the river basin.
Field identification & locations
Easily identified by their smooth, rounded appearance and association with water bodies. Found globally in rivers, streams, and along shorelines.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary