Here's why:
* Clastic sedimentary rocks are formed from fragments of other rocks (clasts) that are cemented together. Examples include sandstone, shale, and conglomerate.
* Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are transformed by heat, pressure, and/or chemically active fluids. Schist is a metamorphic rock that originates from shale or mudstone.
Schist is characterized by its foliation, which means it has a layered or banded appearance due to the alignment of platy minerals like mica during the metamorphic process.
