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clast

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.04 sec.
clast [klast]
(geology)
An individual grain, fragment, or constituent of detrital sediment or sedimentary rock produced by physical breakdown of a larger mass.


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The fragmentation of the magmatic foam is violent and causes the bubble clasts to collide against the conduit wall and with each other resulting in finely dispersed fragments (Cashman et al.
When the soil thaws, the rock settles down, but not quite as far, so that after a number of seasons the combined action of the soil convection and the clast movement results in a sorted pattern.
In hand specimen, leached, oxidized, and sheared San Diego breccia consists of cobble to boulder sized, sub-rounded aphanite clasts in a dark gray, amorphous silica matrix.
 
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