Thin-section micrographs showing the main features of Type I samples: (1) “micaceous hornfels” clast. Note the poikiloblastic texture of the central scapolite, with numerous inclusions (plane-polarized light; sample BCOR 71); (2) “Micaceous hornfels” clast. Note the tourmaline and anorthite inclusions in the central scapolite (plane-polarized light; sample BCOR 71). Abbreviations from Whitney and Evans (2010).