Angular fragments of rock produced by movement along a fault or explosive igneous activity The material which surrounds the fragments and cements them together is called matrix and might be vein minerals, igneous material or very fine rock fragments
a sedimentary rock consisting of variable sized angular, particles that are transported a short distance to the site of deposition These particles may be transported by streams or mudflows
08 in. (2 mm). Breccia commonly results from processes such as landslides or geologic faulting, in which rocks are fractured. It can also be of igneous explosive origin (e.g., a volcanic breccia)
— A coarse-grained rock, composed of angular, broken rock fragments held together by a mineral cement or a fine-grained matrix
A coarse-grained clastic rock, composed of angular broken rock fragments held together by a mineral cement or in a fine-grained matrix; it differs from conglomerate in that the fragments have sharp edges and unworn corners
Sedimentary rock composed of angular fragments of derived material cemented together, often the main component of cave or fissure fillings