  We study gravitino dark matter and slow gravitino decays within the framework
of R-violating supersymmetry, with particular emphasis on the flavour
dependence of the branching ratios and the allowed R-violating couplings. The
dominant decay modes and final state products turn out to be very sensitive to
the R-violating hierarchies. Mixing effects can be crucial in correctly
deriving the relative magnitude of the various contributions, particularly for
heavy flavours with phase space suppression. The study of the strength of
different decay rates for the gravitino is also correlated to collider
signatures expected from decays of the Next-to-Lightest Supersymmetric Particle
(NLSP) and to single superparticle production.
