Rock Identifier

sedimentary

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

AI-generated identification · may be incorrect

Composed of mixed mineral fragments primarily quartz, feldspar, and rock fragments. Variable hardness ranging from 6 to 7 on the Mohs scale depending on specific pebble composition. Mixed colors including tan, brown, gray, and white. Dull to vitreous luster.

Identified July 28, 2026More sedimentary →

Explore Gravel and Sand Aggregate in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Composed of mixed mineral fragments primarily quartz, feldspar, and rock fragments. Variable hardness ranging from 6 to 7 on the Mohs scale depending on specific pebble composition. Mixed colors including tan, brown, gray, and white. Dull to vitreous luster.

Formation & geological history

Formed through the physical weathering and erosion of pre-existing rocks, followed by the transport and deposition by water in rivers, streams, or glacial environments.

Uses & applications

Widely used in construction as aggregate for concrete, road base, asphalt, and general landscaping.

Geological facts

Gravel deposits often accumulate in riverbeds and glacial outwash plains, acting as natural water filters.

Field identification & locations

Found worldwide in riverbeds, beaches, and quarries; identified by loose, granular mixtures of small rock fragments and pebbles.

More like this

Other sedimentary specimens

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion (Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image) — fossil

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock (Sedimentary limestone with invertebrate fossil imprint) — fossil

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone (Arenite (if sandstone)) — Sedimentary

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Shale (Shale (clastic sedimentary rock)) — sedimentary

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone) (Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)) — sedimentary

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)