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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.
Cleavage is controlled by the internal crystalline order of the mineral. A mineral can have 1, 2, 3, 4, or 6 planes of cleavage. If more than one (1) plane is present, it is important to note the angles between the cleavages. Cleavage can be obscured, but is diagnostic when present.