Breccia (Sedimentary) identification and geology

Browse this collection and related resources

• Browse all rock identification entries — Compare this entry with the complete GeoMiner rocks collection.
• Previous: Boninite — Unusual high-magnesium, low-titanium volcanic rock found exclusively in forearc settings of subduction zones.
• Next: Buchite — Partially fused rock formed by extreme contact metamorphism immediately adjacent to igneous intrusions or by lightning strikes.
• Conglomerate
• Agglomerate
• Conglomerate vs Breccia — Compare observable properties and safer field tests.

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner

GeoMiner

Last updated

2026-02-10T20:33:30.208882+00:00

Review status

Published; not independently peer-reviewed

• Rocks — U.S. National Park Service. Authoritative overview of rock groups, the rock cycle, and geologic processes.
• Can you identify my rock or mineral? — U.S. Geological Survey. Identification limitations and routes to in-person professional verification.

Read GeoMiner's editorial methodology or report a content issue.

Common questions

What is Breccia Sedimentary?

Coarse-grained sedimentary rock composed of angular fragments 2 mm cemented together. Angular clasts indicate minimal transport.

How can you identify Breccia Sedimentary?

Compare several properties rather than relying on colour alone. This entry records rock type: Sedimentary Clastic; texture: Clastic, angular fragments; grain size: Coarse 2 mm, angular; common minerals: Variable rock fragments, Calcite cement, Silica cement. Confirm an important identification with additional field tests or qualified laboratory work.

How does Breccia Sedimentary form?

Forms from rockfalls, debris flows, fault zones, and collapse of cave roofs. Angular fragments indicate short transport.

Where is Breccia Sedimentary commonly found?

Found in fault zones, talus slopes, cave systems, and volcanic regions worldwide.

What is Breccia Sedimentary commonly confused with?

Breccia Sedimentary may be confused with Conglomerate, Agglomerate, Fault Gouge. Compare multiple diagnostic properties because colour and surface appearance can overlap.