Foliated rocks on Criffel

 

I read here that the rock on Criffel is not granite but granodiorite. More on that later. But it also said that the rock is foliated and I wondered what that meant. It's easily applied to metamorphic rocks because they form into layers but the crystals in igneous rocks can also be lined up as shown here. So do the mica crystals above show similar lines. Sort of, but it's not screaming out at me. This suggests mechanisms such as convection in a magma chamber or frictional drag from the walls of the chamber.