* Sedimentary Rocks: Clay is a type of sediment, meaning it's small particles of weathered rock and minerals. Over time, these clay particles can accumulate in layers, get compacted by pressure, and cemented together by dissolved minerals. This process forms shale, a type of sedimentary rock.
* Metamorphic Rocks: Shale, under intense heat and pressure deep within the Earth, can be transformed into a different type of rock. This process is called metamorphism, and it can create rocks like slate, phyllite, schist, and even gneiss, all of which are derived from clay.
So, while clay itself is not a rock, it can be the building block for various sedimentary and metamorphic rocks.
