sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

AI-generated identification · may be incorrect

Hardness: variable based on matrix and clasts (typically 6-7 if quartz-rich); Color: Tan, white, and earthy tones with visible rounded pebbles; Luster: Dull to earthy; Structure: Clastic with rounded clasts; Cleavage: None

Color: Tan, white, and earthy tones with visible rounded pebbles
Luster: Dull to earthy

Identified June 20, 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 through the lithification of rounded gravel and pebbles, typically in high-energy environments like riverbeds, alluvial fans, or beaches where water action rounds the stones over time.

Uses & applications

Primarily used as a low-grade construction aggregate, fill material, and occasionally as a decorative stone in landscaping or interior design (puddingstone).

Geological facts

Conglomerate is often referred to as 'puddingstone' because its appearance resembles a fruit pudding. It is the sedimentary equivalent of a breccia, which contains angular rather than rounded fragments.

Field identification & locations

Identify in the field by looking for rounded pebbles (clasts) larger than 2mm cemented in a finer-grained matrix. Commonly found in ancient river systems and mountain basins.