Cleavage/fracture
Cleavage and fracture are mineral properties that describe the way a mineral breaks when cracked. Cleavage is a way a mineral breaks along its plane of weakness. These planes of weakness can be described as where the atomic bonding between atoms in the crystal structure is weak at those points causing the mineral break when stressed much like a stack of papers when dropped will spread off in single sheets. There are five basic types of cleavage.