Fractures, veins and voids in chromitites. Examples of microstructures observed in secondary electron images in the CH4-rich samples AET1, AET5 and MSK. (a) Serpentine filled vein with pores and fracture at the boundary between serpentine and Cr-spinel. (b) Detail of a crack in a Cr-spinel crystal. (c) Fractures in Cr-spinel. (d) Pores in chlorite. (e) Detail of the voids in serpentine. (f) Tectonically fragmented Cr-spinel.