## A structure hierarchy for silicate minerals: chain, ribbon ...

A structure hierarchy is developed for chain-, ribbon- and tube-silicate based on the connectedness of one-dimensional polymerisations of (TO 4) n− tetrahedra, where T = Si 4+ plus P 5+, V 5+, As 5+, Al 3+, Fe 3+, B 3+, Be 2+, Zn 2+ and Mg 2+.Such polymerisations are described by a geometrical repeat unit (with n g tetrahedra) and a topological repeat unit (or graph) (with n t vertices).