  We study the Anderson-type transition previously found in the spectrum of the
QCD quark Dirac operator in the high temperature, quark-gluon plasma phase.
Using finite size scaling for the unfolded level spacing distribution, we show
that in the thermodynamic limit there is a genuine mobility edge, where the
spectral statistics changes from Poisson to Wigner-Dyson statistics in a
non-analytic way. We determine the correlation length critical exponent, $\nu$,
and find that it is compatible with that of the unitary Anderson model.
