# What's the difference between cleavage and fracture?

I see both terms refereing to fractures on crystals or minerals, so I wonder if they could be considered synonymous.

If no, what's the difference between both terms?

Cleavage means breaking along planes defined by crystallographic directions. For example, cubic crystals like halite, NaCl, often cleave along directions that follow the cubic form. However, with a different bond strength, like fluorite $$\ce{CaF2}$$, the crystals cleave most easily along octahedral directions, similar to two pyramids sharing a base.