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..
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Volcanic Breccia

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

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