Single-crystal conductivity measurements of the electride K+(cryptand[2.2.2])e(-) show pronounced anisotropy. Conductivity of the sheetlike crystals is 10-30 times greater in the "easy" than in the "hard" in-plane direction and 10(5)-10(6) times greater than that perpendicular to the plane. The magnetic susceptibility is well-described by the alternating linear chain Heisenberg antiferromagnetic model. Both phenomena are consistent with the structure, which has very open pseudo-1D channels that connect large dumbbell-shaped two-electron cavities to form a chain of coupled electron spins. Slightly smaller channels interconnect these chains to form a 2D network of channels and cavities. The proposed conductivity mechanism is the random 2D hopping of hole defects that are highly mobile down the open 1D chain. They undergo activated transport to adjacent chains as a result of defect sites (such as K-) in the primary chain.