FEATHER FEATURES IN QUARTZ: STRUCTURAL AND TEXTURAL INSIGHTS FROM FIRST TEM AND EBSD MEASUREMENTS.

Feather features (FFs) are a recently discov-ered [1], deformational feature in quartz that has been found in 26 confirmed impact craters so far [2]. They are suggested to form under low shock pressures [2] and potentially can be added to the list of shock-induced microstructures in quartz, along with PDFs and planar fractures. FFs consist of a main planar fracture (PF) that has been sheared during shock compression and from which short, parallel to subparallel lamellae emanate in one direction, typically at an angle of 50-60°. The orientation of these lamellae is always con-sistent with the sense of shear along the fracture. The crystallo-graphic orientation of the fracture and lamellae show a degree of crystallographic control, with (0001), {101;¯1} and {112;¯2} as the most common rational low index crystallographic planes.