breccia

Etymology

Borrowed from Italian breccia, from French brèche, from Middle French breche, from Old French breche, from Vulgar Latin *breca, of Germanic origin, from Frankish *breka.

noun

1. (petrology) A rock composed of angular fragments in a matrix that may be of a similar or a different material.
   Courses of angular boulders line the rim of the volcano, the remains of its last explosive phase, resulting in a volcanic breccia. 2004, Richard Fortey, The Earth, Folio Society, published 2011, page 24