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Full Definition of CLEAVAGE. 1. a: the quality of a crystallized substance or rock of splitting along definite planes; also: the occurrence of such splitting b: a fragment (as of a diamond) obtained by splitting. 2. : the action of cleaving: the state of being cleft. 3.
The fracture cleavage is the dominating structural element of a slate and greatly influences the bending strength and the way processing. Because of this, the investigation of the fabric of a slate mainly focuses on the nature or character of the fracture cleavage.n slates with a spaced cleavage, the fabric elements are not homogeneously distributed but rather defined by domains of layers with a different composition (mica layers). In a spaced foliation the domainal structures have a spacing of more than 10 Âµm and most roofing slates show this spaced fracture cleavage.