sedimentary

Breccia

Lithic breccia (angular rock fragments cemented in a finer matrix)

AI-generated identification · may be incorrect

Coarse, poorly sorted angular clasts, mostly gray and white, set in a dark matrix; clasts appear to include several rock types. Hardness and luster vary with composition; no single crystal structure or cleavage.

Identified October 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed when angular fragments accumulated after breakage and were cemented by finer sediment or minerals. The image alone cannot establish its age or exact setting.

Uses & applications

Breccia is used as decorative and dimension stone, aggregate, and sometimes in jewelry or specimen collections.

Geological facts

Unlike conglomerate, breccia is identified by its predominantly angular clasts, indicating little transport or abrasion before lithification.

Field identification & locations

Look for distinct sharp-edged fragments cemented together; common settings include fault zones, landslides, volcanic deposits, and sedimentary debris flows. The pictured sample’s precise origin is uncertain.