What the foliated rocks turn into?

Foliated rock often develops planes of cleavage. Slate is an example of a foliated metamorphic rock, originating from shale, and it typically shows well-developed cleavage that allows slate to be split into thin plates. The type of foliation that develops depends on the metamorphic grade.

How are foliated metamorphic rocks formed and what do they look like?

Metamorphic rocks have been modified by heat, pressure, and chemical processes, usually while buried deep below Earth's surface. ... Gneiss is a foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. It typically contains abundant quartz or feldspar minerals.