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clastic Syllabification: clas·tic
Pronunciation: /ˈklastik/

Definition of clastic in English:


Denoting rocks composed of broken pieces of older rocks.
Example sentences
  • Mechanical deposition, by water or wind, produces clastic rocks composed of broken fragments, generally of silicate minerals and small pieces of rock: sandstones and conglomerates.
  • The Allouez Conglomerate is composed mainly of red-colored clastic rocks with lesser amounts of sandstone and siltstone.
  • In contrast, the Cambrian clastic rocks are characterized by a paucity of these zircons, suggesting a significant difference between Neoproterozoic and Cambrian drainage systems.


Late 19th century: from French clastique, from Greek klastos 'broken in pieces'.

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