Ferrite IS conductive; RTFDS.

Specifically, MnZn ferrite is a semiconductor, with modest resistivity in the usual form. You'll measure on the order of 10s of kohms when you probe across a core.
NiZn ferrite is also a semiconductor, but typically much higher resistivity (hmm, I'm not sure offhand if this is a bandgap thing, or a doping thing, or an impurities thing), in the megs range.
Tim