noun. Rock composed of sharp-angled fragments embedded in a fine-grained matrix.

noun. In geology, a conglomerate in which the fragments, instead of being rounded or water-worn, are angular.

noun. A rock composed of angular fragments either of the same mineral or of different minerals, etc., united by a cement, and commonly presenting a variety of colors.

noun. a breccia containing bones, usually fragmentary.

noun. a breccia containing coins.

noun. A rock composed of angular fragments in a matrix that may be of a similar or a different material.

noun. a rudaceous rock consisting of sharp fragments embedded in clay or sand

"It may also be called a breccia, for it is composed of black fragments, larger or smaller, derived from other rocks, whose angular shape indicates that they have not travelled far from the spots where they occur."

rudaceous rock  

alabaster  augite  basalt  clay-slate  gneiss  

aa  abyssal rock  agglomerate  agglomeration  basalt