  Gases of doubly-dipolar particles, with both magnetic and electric dipole
moments, offer intriguing novel possibilities. We show that the interplay
between doubly-dipolar interactions, quantum stabilization, and external
confinement results in a rich ground-state physics of supersolids and
incoherent droplet arrays in doubly-dipolar condensates. Our study reveals
novel possibilities for engineering quantum droplets and droplet supersolids,
including supersolid-supersolid transitions and the realization of supersolid
arrays of pancake droplets.
