Figure 6 (a) Projected view of a {Na4Cl8} unit [displacement ellipsoids as in Fig. 5(d)]. (b) The octahedral arrangement of Cl3A, Cl3B, Cl3D, and Cl4 in an {Na4Cl8} unit. (c) Partial structure showing the lengths between some Cl sites. (d) μ4-Cl3D-centered Na4 unit with distorted tetrahedral shape.