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.
Mid 20th century: back-formation from clastic.
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