  We study the spin- and flavour- dependent SU(6) violations in the baryon
spectrum by means of a G\"ursey Radicati mass formula. The average energy of
each SU(6)-multiplet is described using the SU(6) invariant interaction given
by a hypercentral potential containing a linear and a hypercoulomb term. We
show that the non strange and strange baryon masses are in general fairly well
reproduced and moreover that the G\"ursey Radicati formula holds in a
satisfactory way also for the excited states up to 2 GeV. The coefficients of
the G\"ursey Radicati SU(6) breaking part obtained by the fit of the
three-quark spectrum can be used to evaluate in first approximation the
splitting within multiplets also for exotic baryon systems.
