The anomalously low magnetic moments forMnxFe3−xO4spinels with1<x≤3are qualitatively explainedby a Yafet-Kittel triangular moment arrangement. Values of&bgr;,n, and&agr;are calculated from measurementsof magnetic moment, high field susceptibility, and Curie temperature. The measurements onMn3O4yielda moment of 1.73 Bohr magnetons and a susceptibility of3.5×10−4 gauss/oersted. An extrapolated anisotropyfield of 150 kilo-oersted is found. Transitions from the triangular state to a Ne´el-type arrangementare found to occur forx = 1.25,x = 1.55, andx = 1.80. ForMn3O4,&agr;&bgr;values suggest that the vanishing of thespontaneous magnetization at 42°K represents a transition to a paramagnetic-antiferromagnetic state.