Etymology
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clastic (adj.)

"consisting of broken pieces, breaking up into fragments," 1868 in reference to anatomical models, 1870 in geology, from Latinized form of Greek klastos "broken in pieces," from klan, klaein "to break," which is perhaps from PIE *kla-, variant of root *kel- "to strike" (see holt), but more likely of uncertain origin [Beekes].

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Definitions of clastic

clastic (adj.)
of or belonging to or being a rock composed of fragments of older rocks (e.g., conglomerates or sandstone);
clastic (adj.)
capable of being taken apart;
the professor had a clastic model of the human brain
From wordnet.princeton.edu