Gneis
Gneiss ( /ˈnaɪs/) is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. It is foliated (composed of layers of sheet-like planar structures). The foliations are characterized by alternating darker and lighter colored bands, called "gneistic banding".
Read more about Gneis: Etymology, Composition, Types