Minerals that split along flat surfaces are called cleavage minerals.

The specific name of the mineral depends on the direction and quality of its cleavage. For example:

* Mica has perfect basal cleavage, meaning it splits easily into thin sheets.

* Halite (rock salt) has cubic cleavage, meaning it breaks along three sets of parallel planes at 90-degree angles.

* Calcite has rhombohedral cleavage, meaning it breaks along three sets of parallel planes that are not at 90-degree angles.

So, while there isn't one single name for all cleavage minerals, the term cleavage itself describes this important property.