One of the main types of iron meteorites composed almost entirely of kamacite and named for its cubic (hexahedral) cleavage of α-Fe-Ni crystals. Upon etching, hexahedrites do not display a Widmanstätten pattern, but do often exhibit fine, parallel lines called Neumann lines for their discoverer, Franz Neumann, who first studied them in 1848. These lines represent shock-induced, structural deformation of the kamacite plates, and reveal an impact history for the hexahedrite parent body, at least for the hexahedrites related to chemical group IAB.


Some or all content above used with permission from J. H. Wittke.