Clast

n. individual rock fragment that has broken off a larger piece of rock

Clastic rocks are comprised of fragments, or clasts, of pre-existing rock. The term is most commonly, but not uniquely, applied to sedimentary rocks.
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Noun
1. (geology) a constituent fragment of a clastic rock
(hypernym) fragment
(part-holonym) clastic rock
(classification) geology

clast
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