What does breccia mean?
Breccia is a type of rock composed of sharp, angular fragments of minerals or older rocks that have been cemented together by a finer-grained material. Unlike conglomerate, whose pebbles are smoothed and rounded by long transport in water, breccia's jagged pieces indicate they were broken and deposited close to their source, often with little or no movement between. Geologists classify breccias by origin: fault breccia forms when rock is crushed along moving fractures, volcanic breccia from explosive eruptions and lava flows, sedimentary breccia from debris flows and landslides, and impact breccia from the shattering force of meteorite strikes. The term also appears outside geology, since certain colorful breccias have long been prized as ornamental building stone, notably in ancient Rome. For readers of science writing, archaeology, or earth history, recognizing the word signals fragmented, violent origins — a rock record of breakage rather than gentle erosion.
nounA rock composed of sharp, angular fragments of mineral or pre-existing rock cemented together in a finer-grained matrix.
- Geology: a coarse rock composed of angular fragments cemented in a finer matrix, formed by processes such as faulting, volcanic activity, sedimentation, or meteorite impact.
"The canyon walls were built of breccia, its jagged fragments glinting like shattered pottery frozen in stone."
"Geologists identified the layer as fault breccia, evidence that the rocks had been violently ground together along the fracture."
"The museum's collection included a striking red breccia quarried in antiquity for Roman columns and floors."
As a mass noun it usually has no plural, but 'breccias' is used when referring to distinct types or occurrences, e.g. different geological formations.
"The region contains breccias of both volcanic and tectonic origin."
When an asteroid slams into a planet, the shattered rock it leaves behind is called impact breccia — a literal fingerprint of cosmic collision.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of breccia
Breccia entered English in the early seventeenth century from Italian, where it meant 'broken stone' or rubble, ultimately deriving from a Germanic root related to breaking — the same source behind English 'break' and 'breach'. Italian quarrymen used it for masses of shattered rock, and the term was adopted into scientific vocabulary as geology formalized its classification of fragmental rocks. Its cognates thus include everyday words of rupture such as 'breach', all tracing back to the notion of something forcibly broken.
Related word forms
How breccia is actually used
Breccia is a technical term used chiefly in geology and archaeology, though it appears in art history and architecture when describing decorative ornamental stone. It functions as a mass noun and takes singular agreement, even though it denotes a rock composed of many fragments.
Easily confused with breccia
Conglomerate is a sedimentary rock made of rounded, water-worn pebbles, whereas breccia is made of sharp, angular fragments that were not transported far enough to be rounded.