Breccia is an uncommon, coarse-grained, siliciclastic sedimentary rock. Breccias form in many ways (sedimentary breccias, volcanic breccias, tectonic breccias/fault breccias, collapse breccias, boiling breccias, hydrothermal breccias, seismite breccias, injectite breccias, etc.), but they all have the same general appearance. Sedimentary breccias contain a mix of large & small grains. The large grains (gravel - pebbles or cobbles or boulders) are angular to subangular in shape, and they are surrounded by a finer-grained matrix, usually sand or mud.
Jasper Breccia (cut & polished surface) - this attractive breccia contains abundant reddish- and yellowish-colored chert fragments surrounded by a very dark brown matrix of finer-grained material. I’m not sure of the provenance of this rock, but I suspect it comes from Arkansas or Oklahoma (corrections or verifications are welcome).