  Suspensions of hard colloidal particles frequently serve as model systems in
studies on fundamental aspects of phase transitions. But often colloidal
particles that are considered as ``hard'' are in fact weakly charged. If the
colloids are spherical, weak charging has a only a weak effect on the
structural properties of the suspension, which can be easily corrected for.
However, this does not hold for anisotropic particles.
  We introduce a model for the interaction potential between charged ellipsoids
of revolution (spheroids) based on the Derjaguin approximation of
Debye--H\"uckel Theory and present a computer simulation study on aspects of
the system's structural properties and phase behaviour. In line with previous
experimental observations, we find that even a weak surface charge has a strong
impact on the correlation functions. A likewise strong impact is seen on the
phase behaviour, in particular, we find stable cubatic order in suspensions of
oblate ellipsoids.
