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Grain size
Particle size
, also called
grain size
, refers to the
diameter
of individual grains of
sediment
, or the
lithified
particles in
clastic rocks
. The term may also be applied to other
granular materials
. This is different from the
crystallite
size, which refers to the size of a single
crystal
inside a particle or grain. A single grain can be composed of several
crystals
.
Granular material
can range from very small
colloidal particles
, through
clay
,
silt
,
sand
, and
gravel
, to
boulders
.
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