Fe-Ni-S Pt-Fe alloy 140 170 Fleet & Stone 1991 Fe-Ni-S sulfide 0.2 Fleet & Stone 1991 FeS-NiS-CuS 0.17 0.26 Fleet et al. 1993 komatiite-tholeiite 0 1 Barnes et al. 1994 komatiite-tholeiite 0.1 0.179 Barnes et al. 1994 pyrrhotite 0.0065 0.086 Li et al. 1993