What type of mineral is foliated or has wavy bands?

Foliated minerals are typically metamorphic minerals that exhibit a layered or banded appearance due to the alignment of platy or elongated mineral grains under directed pressure. Common examples include schist and gneiss, which often display wavy bands created by the differential crystallization and orientation of minerals like mica, quartz, and feldspar. The foliation in these rocks reflects the conditions of metamorphism they underwent.