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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.
By way of examples , the micas have a perfect cleavage in one direction that is easy to produce ; calcite has a perfect cleavage in three directions that is also easy to produce ; the feldspars have a perfect cleavage in one direction that is easy to produce and a good cleavage in another direction that is hard to produce ; and diamond has a perfect ...