  We study the non-radial oscillation modes of strange quark stars with a
homogeneous core and a crust made of strangelets. Using a 2-component equation
of state (core+crust) for strange quark stars that can produce stars as heavy
as 2 solar masses, we identify the high-frequency l=2 spheroidal (f, p) in
Newtonian gravity, using the Cowling approximation. The results are compared to
the case of homogeneous compact stars such as polytropic neutron stars, as well
as bare strange stars. We find that the strangelet crust only increases very
slightly the frequency of the spheroidal modes, and that Newtonian gravity
overestimates the mode frequencies of the strange star, as is the case for
neutron stars.
