Gneiss from Queenstown, New Zealand $19.00 – $400.00 Gneiss ( /ˈnaɪs/) is a common 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 often foliated (composed of layers of sheet-like planar structures). The foliations are characterized by alternating darker and lighter colored bands, called “gneissic banding”. Select options This product has multiple variants. The options may be chosen on the product page