Abstract
Sphere configurations and partitions of three-dimensional space into Dirichlet domains have been studied for the point configurations of the trigonal lattice complex R[unk]m 6(c). In total, 11 sphere-configuration types and 12 types of Dirichlet partitions have been derived. Utilizing the concepts of Hoppe (1970, 1979) and O'Keeffe (1979), coordination numbers for this two-dimensional field have been calculated.