  On the basis of a recent field theory for site-disordered spin glasses a
Ginzburg-Landau free energy is proposed to describe the low temperatures glassy
phase(s) of site-disordered magnets. The prefactors of the cubic and dominant
quartic terms change gradually along the transition line in the
concentration-temperature phase diagram. Either of them may vanish at certain
points $(c_*, T_*)$, where new transition lines originate. The new phases are
classified
