Ni
All chondrites and some achondrites
(top) have very much higher concentrations of Ni (also Co,
Ir, Au, and some other rare elements)
than nearly any terrestrial rock. Some of the rarer types
of meteorites (lunar, martian, eucrites; bottom), however,
do not have high concentrations of Ni. High-Ni terrestrial
rocks tend to be ultramafic rocks like dunites, peridotites,
pyroxenites, and serpentinites.
See Notes,
Caveats, and References
