sedimentary

Conglomerate / Breccia Matrix (Aggregated Rock)

Sedimentary Breccia / Conglomerate

AI-generated identification · may be incorrect

Hardness: 3-7 (variable depending on mineral matrix and clasts); Color: Greyish-green to dark grey angular clasts set in a light-colored matrix; Luster: Dull to earthy; Texture: Clastic, unsorted fragments bound by fine-grained mineral cement.

Hardness: 3-7 (variable depending on mineral matrix and clasts)
Luster: Dull to earthy

Identified July 27, 2026More sedimentary →

Explore Conglomerate / Breccia Matrix (Aggregated Rock) 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 cementation of angular to semi-rounded rock fragments (clasts) transported over short distances by water, landslide deposits, or high-energy sedimentary environments.

Uses & applications

Used primarily in construction aggregate, decorative stone cladding, floor tiles (terrazzo style), and geological study.

Geological facts

Breccia and conglomerate rocks retain a snapshot of ancient river beds, alluvial fans, or debris flows, preserving fragments of older rocks intact.

Field identification & locations

Identified by visible angular or rounded clasts embedded within a contrasting fine-grained matrix. Widely found in mountain bases, ancient stream beds, and fault zones.