Fig. 2
From: Space weathering signatures in sulfide and silicate minerals from asteroid Itokawa
Microstructural and chemical properties of space weathered Fe-sulfide. a HRTEM images showing the occurrence of a nanocrystalline rim in the outermost ~ 10 nm of the grain. b HRTEM image indicating that the unaltered region presents d-spacing value of 2.93 Å that matches (110) troilite and the rim has lattice fringes with values of 1.45 Å similar to (200) metallic iron. A strained region is shown by the green arrow. c HAADF image overlain with S and Fe EDS maps and d EDS line scan revealing that the nanocrystalline rim is depleted in S and enriched in Fe compared to the interior of the grain