sedimentary

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (quartz/chert matrix); Color: Tan, beige, grey, and light brown; Luster: Dull to earthy; Texture: Fine to medium-grained with embedded clasts; Cleavage: None.

Hardness: 6-7 on Mohs scale (quartz/chert matrix)
Color: Tan, beige, grey, and light brown
Luster: Dull to earthy

Identified July 25, 2026More sedimentary →

Explore Conglomerate Pebble (with Chert / Quartz) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6-7 on Mohs scale (quartz/chert matrix); Color: Tan, beige, grey, and light brown; Luster: Dull to earthy; Texture: Fine to medium-grained with embedded clasts; Cleavage: None.

Formation & geological history

Formed by the accumulation, compaction, and cementation of rounded to sub-angular rock fragments and mineral grains carried by ancient rivers, streams, or coastal waters.

Uses & applications

Commonly used as construction aggregate, landscaping pebbles, and as educational specimens for studying sedimentary rock formation.

Geological facts

Sedimentary rocks like conglomerates capture snapshots of ancient river systems, reflecting the energy of the water flow that once transported the fragments.

Field identification & locations

Identified by the rounded to sub-angular inclusions embedded in a fine-grained sandy or silty matrix. Widespread in riverbeds, glacial deposits, and sedimentary basins worldwide.