sedimentary
Gravel and Pebbles
Unconsolidated rock fragments (clastic sediment)
Variable hardness (ranging from Mohs 3 to 7 depending on mineral composition like quartz or feldspar), mixed colors including brown, grey, and tan, dull to vitreous luster, various crystal and amorphous structures.
Identified More sedimentary →
Explore Gravel and Pebbles in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Variable hardness (ranging from Mohs 3 to 7 depending on mineral composition like quartz or feldspar), mixed colors including brown, grey, and tan, dull to vitreous luster, various crystal and amorphous structures.
Formation & geological history
Formed through the weathering and erosion of pre-existing rocks, subsequently transported and rounded by water, ice, or wind in fluvial, glacial, or marine environments.
Uses & applications
Used extensively in construction, road building, concrete aggregate, and landscaping.
Geological facts
Gravel is classified by grain size according to the Wentworth scale, typically ranging from 2 mm to 64 mm in diameter.
Field identification & locations
Found abundantly in riverbeds, beaches, and glacial deposits worldwide; helpful for geologists in determining ancient river flows and provenance.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary