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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.
Some mineral s have three planes of cleavage : If the three cleavages intersect at. 90Â° the mineral is said to havecubic cleavage (Figure s 8, 11A): If none of the. cleavage planes intersect at right angles the shape is a squashed cube known as a. rhombohedron (called rhombohedral cleavage -- Figures 8, 11B).