Ni
All chondrites and some achondrites (top) have very 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
