Fig. 1.

FIB-secondary electron micrograph of the interface region between kamacite (bcc iron) and taenite (fcc Fe–Ni), which forms part of the Widmanstätten intergrowth in the Tazewell meteorite. Kamacite (Left) is followed by a rim of pure tetrataenite (Center), which then gives way to the cloudy zone (Right), a nanoscale intergrowth of tetrataenite islands surrounded by an Fe-rich matrix. The cloudy zone transitions from coarse tetrataenite particles ($>$150 nm) to fine tetrataenite particles ($<$50 nm) with increasing distance from the tetrataenite rim. The matrix phase (dark in the image) percolates throughout the entire cloudy zone.