Share this entry
clast Line breaks: clast

Definition of clast in English:


A constituent fragment of a clastic rock.
Example sentences
  • 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.

Definition of clast in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources