Relating to or composed of breccia, a type of rock made of angular rock fragments cemented together.
From breccia (Italian breccia, from Vulgar Latin breccia meaning 'broken stone'), plus the adjective suffix -al. The word traveled from Italian into geological terminology in the 18th century.
Geologists use 'breccial' to describe rocks that are basically nature's way of gluing broken pieces together—it's like a geological mosaic that often forms after earthquakes or volcanic explosions smash rocks into angular fragments.
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