Fig. 3: Microstructure of diverse space-weathered rims on the Chang’e-5 profiled ilmenite grains.
From: Space-weathered rims on lunar ilmenite as an indicator for relative exposure ages of regolith
a Transmission electron microscopy (TEM) image of the undamaged rim on the CE5Z0403 #1 ilmenite grain. b TEM image of the densely damaged rim on the CE5Z0806 #2 ilmenite grain. c The vesicular rim on the CE5Z1002 #2 ilmenite grain. d TEM image of the npFe0-rich rim on the CE5C0200 #2 ilmenite grain. e TEM image of the deeply damaged rim on the CE5Z0204 #1 ilmenite grain. f–i High-resolution TEM images of those areas indicated by white rectangles in (c), (d), and (e). The ilmenite with vesicular rim (f) shows a similar crystallographic orientation with the ilmenite with deeply damaged rim ([4\(\bar{21}\)] zone axis) (h), while the ilmenite with npFe0-rich rims shows a [4\(\bar{4}\)1] zone axis (g).
