sedimentary
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with various inclusions
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Off-white/grey/creamy, Luster: Dull to waxy when unpolished, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.65
Identified More sedimentary →
Explore River Pebble (Quartz-rich) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale), Color: Off-white/grey/creamy, Luster: Dull to waxy when unpolished, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.65
Formation & geological history
Formed through mechanical weathering and erosion of larger rock formations. It has been rounded and smoothed over time by the action of moving water in a river or coastal environment.
Uses & applications
Primarily used in decorative landscaping, construction aggregate, aquarium substrate, and as a material for tumbling and polishing by hobbyists.
Geological facts
River pebbles are geological travelers; their smooth surface is the result of thousands of years of constant tumbling against other rocks, which polishes away sharp edges.
Field identification & locations
Identified by its smooth, rounded egg-like shape and lack of sharp edges. Commonly found in riverbeds, glacial deposits, and beaches. Collectors look for unique colors or translucency.
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