sedimentary

Conglomerate

Conglomerate (Sedimentary rock)

AI-generated identification · may be incorrect

Hardness: variable depending on clasts (usually 3-7); Color: brownish to dark grey with visible clasts; Luster: dull/earthy; Structure: clastic texture with rounded to sub-angular pebbles bound in a finer sandy matrix.

Hardness: variable depending on clasts (usually 3-7)
Color: brownish to dark grey with visible clasts
Luster: dull/earthy

Identified July 6, 2026More sedimentary →

Explore Conglomerate in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed by the lithification of rounded pebbles and gravel-sized clasts. These are typically deposited in high-energy environments like riverbeds or alluvial fans where water rounds the stones over time.

Uses & applications

Mainly used as a decorative stone in construction, concrete aggregate, and as a tool for understanding ancient river flow patterns in geology.

Geological facts

Conglomerate is often called "puddingstone" because the rounded clasts resemble raisins or fruit in a pudding. It is distinguishable from breccia by its rounded rather than angular clasts.