sedimentary
Pebble
Lithified clastic rock fragment / Quartz-rich pebble
AI-generated identification · may be incorrectHardness varies from 6 to 7 on the Mohs scale depending on mineral content; usually gray, brown, or multicolored; dull to sub-vitreous luster; smooth, rounded shape due to water or wind erosion.
Identified More sedimentary →
Explore Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies from 6 to 7 on the Mohs scale depending on mineral content; usually gray, brown, or multicolored; dull to sub-vitreous luster; smooth, rounded shape due to water or wind erosion.
Formation & geological history
Formed through the physical weathering and erosion of larger parent rocks, followed by the transport and rounding of fragments by water in rivers, streams, or ocean waves over thousands to millions of years.
Uses & applications
Used in landscaping, gardening, concrete aggregate, pathways, and decorative aquarium substrates.
Geological facts
Pebbles are scientifically classified based on their size, typically ranging from 4 to 64 millimeters in diameter according to the Krumbein phi scale.
Field identification & locations
Found abundantly along riverbeds, beaches, and ancient alluvial deposits; easily identified by its smooth, water-worn texture and small size.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary