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 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
Fault rocks composed of angular fragments (clasts) of wall rock set in a finer-grained matrix of crushed wall-rock material Matrix is subordinate to clasts, comprising less than 30% of the breccia
Fragments of rock, generally angular in a fine grained matrix, or a matrix of cementing material Breccias include tectonic brecccias, clastic brecccias and volcanic breccias
(1) Fragmental rock whose components are angular and therefore, as distinguished from conglomerates, are not waterworn (2) Rock made up of highly angular coarse fragments that may be sedimentary or formed by the action of crushing or grinding along faults (3) Volcanic breccia is a more-or-less indurated pyroclastic rock consisting chiefly of accessory and accidental angular ejecta 32 mm or more in diameter lying in a fine tuff matrix