clast
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(klăst) 
n.
A rock fragment or grain resulting from the breakdown of larger rocks.
n.
A rock fragment or grain resulting from the breakdown of larger rocks.
[From Greek klastos, broken, from klān, to break.]
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[De]
A geological term used to describe an individual component within a body of sediment that is applied in archaeology especially with reference to components of a deposit that have been introduced (clastic inclusions). Thus archaeological objects are clasts within a sediment matrix and tempering agents are large clasts within a clay matrix.
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