What is a metamorphic rock in which the grains line up in layers is called?

A metamorphic rock in which the grains line up in layers is called schist. This alignment occurs due to the intense pressure and heat that alters the rock's original minerals, causing them to recrystallize and orient themselves parallel to one another. This layered texture is known as foliation, which is characteristic of many metamorphic rocks. Other examples include gneiss and slate, which also exhibit similar layering.