Metamorphic rocks are formed when heat and pressure morph this rock together and make this rock compound and solid, this rock can be foliated and non foliated, that means that there can be patterns in the rock and there also cant be patterns in the rock.
This rock is called schist, this rock has a rough coarse texture and its manly black and almost never foliated. This rock is found in caves and mining sites.
This rock is called Gneiss, this rock is rough as well but on the light side. This rock as you can see above is foliated, its not always foliated but there are patters in these rock.