Cataclastic rocks contain angular fragments formed by
cataclasis.
Cataclasis is a deformation of the rock caused by fracture and rotation of
aggregates or
mineral grains. The term cataclastic refers to the structure produced in a rock by the actions of severe mechanical stresses that occur during
metamorphism. Characteristic features of cataclastic
metamorphism include the bending, breaking, and granulation of minerals.Cataclastic structures, also called mortar structures, or "porphyroclastic," are
granites and
gneisses that are produced by dynamic
metamorphism of
crystalline rock, and are characterized by
mica-free
aggregates of small finely-crushed grains of
quartz or
feldspar that fill the interstices between larger individual relicts and thus resemble stones set in mortar.
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