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American Dictionary of the English Language

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Breccia


BREC'CIA, noun In mineralogy, an aggregate composed of angular fragments of the same mineral, or of different minerals, united by a cement, and presenting a variety of colors. Sometimes a few of the fragments are a little rounded. The varieties are the siliceous, calcarious and trap breccias.

When rounded stones and angular fragments are united by a cement, the aggregate is usually called coarse conglomerate.