Computer-aided crystallochemical analysis: TOPOS program package

The modern methods of analysis of geometrical and topological properties of crystal structures, as well as the software for their implementation are r eviewed. The structural-topological TOPOS program package is described. Thi s is the first program to combine the crystallographic database management system, the standard methods of crystallochemical analysis, and a series of new methods invoking parameters of Voronoi-Dirichlet polyhedrons and eleme nts of graph theory. Examples of implementation of the TOPOS program in stu dying the structural features of some substances and searching for the crys tallochemical regularities are presented for the classes of compounds.