  We present the results of a muon-spin relaxation study of GeNi2O4. We provide
further clarification of the two transitions to the antiferromagnetic state and
measure the magnetic field dependence of the heat capacity up to 14 T. Both
oscillatory and relaxing signals are observed below the lower transition (at
temperature $T_{N2}) in the muon-decay positron asymmetry spectra, arising from
two distinct types of magnetic environment. A possible explanation is suggested
in terms of the separate ordering of two magnetic subsystems, one of which does
not order fully down to the lowest measured temperature.
