How does the crystalline structure of a mineral affect its cleavage?

The crystalline structure of a mineral significantly influences its cleavage, which is the tendency of a mineral to break along specific planes of weakness. Minerals with well-defined atomic arrangements, such as those with layered or planar structures, tend to exhibit clear and predictable cleavage patterns. Conversely, minerals with more complex or irregular structures may have less distinct cleavage or none at all. Thus, the symmetry and bonding within the crystal lattice dictate the direction and quality of cleavage.