单词	clast
释义	clast /klast / noun Geology A constituent fragment of a clastic rock.The clasts in volcaniclastic rocks may range from fine ash to bombs and enormous blocks.... This is substantiated by the presence of eroded Permian carbonate clasts. The siltstones contain poorly sorted angular fragments of quartz, and angular clasts and cleavage fragments of plagioclase and alkali feldspar. Origin Mid 20th century: back-formation from clastic.
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