  Basing our arguments on a wave function that contains both positional and
superfluid order, we propose a Ginzburg-Landau functional for a supersolid with
the two order parameters necessary to describe such a phase: density n_B(r) and
supersolid order parameter \psi_V. We argue that adding lighter $^3$He atoms to
a 4He supersolid produces attractive regions for vacancies, leading to patches
of higher T_c. On the other hand, the supersolid stiffness decreases in this
granular state with increased 3He disorder. Both effects are linear in 3He
concentration.
