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Related to breccia: Volcanic breccia
brec·ci·a(brĕch′ē-ə, brĕch′ə, brĕsh′-)
Rock composed of sharp-angled fragments embedded in a fine-grained matrix.
(Geological Science) a rock consisting of angular fragments embedded in a finer matrix, formed by erosion, impact, volcanic activity, etc
[C18: from Italian, from Old High German brecha a fragment; see breach]
brec•ci•a(ˈbrɛtʃ i ə, ˈbrɛʃ-)
rock composed of angular fragments of older rocks melded together.
[1765–75; < Italian < Germanic]
brec′ci•ate`, v.t. -at•ed, -at•ing.
A sedimentary rock made of sharp-edged fragments naturally cemented together.