Chemical separation of FeNi particles after impact Original Research Article

Tiny grains of FeNi system originated from planetesimals or meteoroids can remain under solid (or melt)-solid impact reactions even after impact process, probably together with high pressure form of Fe phase. Impact fragment with major FeSi (Ni) system can be formed under vapor condition of impact reaction from terrestrial and artificial impact craters and spherules, and those with NiCl (S) system in composi- tion are formed under vapor condition of artificial impact experiments on the Barringer iron meteorite. These impact grains of Fe-bearing composition or high pressure form of iron-rich phases will be found probably on the asteroids in future exploration.