The term " feather textures " describes an unusual type of pla-nar microdeformation structure, which has been found in shocked quartz grains in several confirmed impact craters. These features were first described in detail by [1,2], although, to the best of our knowledge they were first reported by [3]. Feather textures consist of a planar fracture (" P1 " in [1,2]) from which a group of thinl...