  Surface effects in strange-quark matter play an important role for certain
observables which have been proposed in order to identify strange stars, and
color superconductivity can strongly modify these effects. We study the surface
of color superconducting strange-quark matter by solving the
Hartree-Fock-Bogoliubov equations for finite systems ("strangelets") within the
MIT bag model, supplemented with a pairing interaction. Due to the bag-model
boundary condition, the strange-quark density is suppressed at the surface.
This leads to a positive surface charge, concentrated in a layer of ~1 fm below
the surface, even in the color-flavor locked (CFL) phase. However, since in the
CFL phase all quarks are paired, this positive charge is compensated by a
negative charge, which turns out to be situated in a layer of a few tens of fm
below the surface, and the total charge of CFL strangelets is zero. We also
study the surface and curvature contributions to the total energy. Due to the
strong pairing, the energy as a function of the mass number is very well
reproduced by a liquid-drop type formula with curvature term.
