Cleavage is a type of secondary foliation associated with fine grained rocks.
2.
For coarser grained rocks, schistosity is used to describe secondary foliation.
3.
Some authors chose to use cleavage when describing any form of secondary foliation.
4.
They state that cleavage is a type of secondary foliation in fine grained rocks characterized by planar fabric elements that form in a preferred orientation.
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