Here's why:
* Foliation: This refers to the development of planar (flat) structures within a rock. These structures are often visible as layers or bands.
* Formation: Foliation arises from the intense pressure and heat that occur during metamorphism. The minerals within the rock are rearranged and aligned perpendicular to the direction of the pressure, creating these distinct layers.
Examples of metamorphic rocks with foliated textures include:
* Slate: Fine-grained and splits easily along its foliation planes.
* Schist: Has a more visible and coarser foliation, with visible mineral grains.
* Gneiss: A banded or layered rock with alternating layers of light and dark minerals.
