sedimentary
River Pebble (Chalcedony / Quartzite)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Color is yellowish-brown to olive green with smooth, water-worn texture. Waxy to vitreous luster, microcrystalline to cryptocrystalline structure, no cleavage, specific gravity around 2.65.
Identified More sedimentary →
Explore River Pebble (Chalcedony / Quartzite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness of 6.5 to 7. Color is yellowish-brown to olive green with smooth, water-worn texture. Waxy to vitreous luster, microcrystalline to cryptocrystalline structure, no cleavage, specific gravity around 2.65.
Formation & geological history
Formed by stream or river erosion over extended periods, rounding down larger silica-rich rocks, quartzites, or cherts into a smooth pebble.
Uses & applications
Commonly used in decorative landscaping, aquarium substrate, craft projects, or as river stone pocket stones.
Geological facts
Smooth river pebbles get their polished surface purely from mechanical abrasion against water, sand, and other stones over thousands of years.
Field identification & locations
Identify by its smooth rounded heart-like shape and waxy surface feel. Found along riverbeds, stream channels, and beaches worldwide.
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