The term used for the way minerals break across planes due to their atomic arrangements is cleavage.

Here's why:

* Cleavage refers to the tendency of a mineral to break along specific planes of weakness within its crystal structure. These planes of weakness are determined by the arrangement of atoms in the mineral.

* Minerals with strong bonds in certain directions and weaker bonds in others will break preferentially along the weaker planes.

Examples of cleavage:

* Mica has perfect cleavage in one direction, splitting into thin sheets.

* Halite (table salt) has cubic cleavage, breaking into cubes.

* Feldspar has two distinct cleavage planes, forming rectangular or rhombic shapes.

Let me know if you have any other questions!