Metamorphic rocks are divided into two categories (1) nonfoliated rocks which do not have distinct layering and (2) foliated rocks which are layered or banded coloring rocks formed when shortened along one axis during recrystallization.

Are metamorphic rocks layered?

Many kinds of metamorphic rocks show a distinctive layering called foliation (derived from the Latin word folia, meaning "leaves"). Foliation develops when a rock is being shortened along one axis during recrystallization.

Which two types of rocks have layers?

Ores rocks have minerals with metals like gold and silver. Sedimentary rocks form layers at the bottom of oceans and lakes. Marble is a metamorphic rock formed when limestone is exposed to high heat and pressure within the Earth. Layers of sedimentary rocks are called strata.