(1) Fragmental rock whose components are angular and therefore, as distinguished from [[conglomerate|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 [[fault|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.