M. Okeeffe et Jm. Sullivan, THE BETA-SN DUAL STRUCTURE - A 4-CONNECTED NET BASED ON A PACKING OF SIMPLE POLYHEDRA WITH 18 FACES, Zeitschrift fur Kristallographie, 213(7-8), 1998, pp. 374-376
The 4-connected net derived by placing vertices in the tetrahedral hol
es of the beta-sn structure is described in its maximum volume conform
ation with equal edge lengths. The vertices correspond to the vertices
of a space filling packing of simple polyhedra with 18 faces (32 vert
ices). The net is less dense than that of the least dense of known zeo
lites.