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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.
When describing cleavage it is also necessary to describe the angle between the cleavage planes. If, for example, a mineral is in the shape of a cube the angle between the cleavage planes should be 90Â°. If, however, the angle is not 90Â° the mineral will no longer have a cubic shape. Below is a brief chart describing the shapes associated with certain cleavages.