Has a version
MgCu2 C15 Laves phase (Fd-3m, ICSD prototype) - relaxed
MgCu2 C15 Laves phase prototype. Fd-3m #227, cubic, a=7.04 Å. Mg at 8a (1/8,1/8,1/8), Cu at 16d (1/2,1/2,1/2). Fully metallic/intermetallic bonding — the minimal discriminator for whether cubic symmetry plus metallic bonding is Orb v3-stable.