Science / Geology / Breccia: A clastic sedimentary rock that is composed of large (over two millimeter diameter) angular fragments. The spaces between the large fragments can be filled with a matrix of smaller particles or a mineral cement which binds the rock together. Picture of Breccia..

Friction Breccia

Science / Geology / Friction Breccia: A breccia formed in a fault zone or volcanic pipe by the relative motion of two rock bodies. MORE

Volcanic Breccia

Science / Geology / Volcanic Breccia: A rock made up of pyroclastic fragments that are at least 64 millimeters in diameter. MORE


Science / Geology / Mylonite: A brecciated metamorphic rock frequently found in a fault zone. The fractured texture is thought to form by the crushing actions of fault movement. MORE


Science / Geology / Diatreme: A volcanic vent filled with breccia by the explosive escape of gases. MORE

Cataclastic Rock

Science / Geology / Cataclastic Rock: A breccia of powdered rock formed by crushing and shearing during tectonic movements. MORE