A metamorphic rock that has visible layers or bands is called a foliated metamorphic rock.

Here's why:

* Foliation: This refers to the development of parallel layers or bands within a rock. These layers are created by the intense pressure and heat during metamorphism, which causes minerals to align themselves in a specific direction.

* Examples of Foliated Rocks:

* Slate: Very fine-grained, with a smooth, flat surface.

* Phyllite: Slightly coarser than slate, with a silky sheen.

* Schist: Has larger, visible mineral grains.

* Gneiss: Distinctive banding of light and dark minerals.

Let me know if you'd like more details about any of these rocks!