Dolomite has rhombohedral cleavage. This means it breaks along three directions that are not at right angles to each other, forming parallelogram-shaped fragments.

Here's a more detailed explanation:

* Rhombohedral: This refers to the shape of the cleavage planes, which are rhombohedrons. A rhombohedron is a six-sided figure with all sides being parallelograms, but not rectangles.

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

Visualizing Dolomite Cleavage:

Imagine a cube. Now, imagine slicing the cube diagonally across all six sides. The shape you'd create is a rhombohedron. Dolomite will break along these diagonal planes, resulting in fragments that have a parallelogram shape.

Note: While dolomite has perfect rhombohedral cleavage, it can also exhibit some irregular fracture, meaning it can break in a less predictable way.