A rock consisting of angular fragments in a finer grained matrix which may or may not be similar to the larger fragments; it may be formed from any rock type by fracturing (in a fault), explosion (volcanic), intrusion ( intrusion breccia) or sedimentation (scree slope). Indicates that they did not travel far from where they fractured.
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 rock characterized by course, angular fragments. The fragments are formed either by a crushing and natural recementing essentially in place or by the deposition of angular pieces that become consolidated.
A rock in which angular fragments are surrounded by a mass of finer-grained material. Breccias may form by explosive volcanic action, by structural deformation (a â€œfault brecciaâ€), by intrusive action (where the intrusive rock incorporates fragments of country rock), or by hydrothermal processes (where wall rock fragments are incorporated by vein material).
Breccia (IPA: , ) is typically a sedimentary rock composed of angular fragments from a previous rock structure, cemented in a matrix that may be of a similar or a different material. It is therefore a clastic rock.