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Abstract
The occurrence of chirality in tetracoordinated covalent networks is investigated by analysing hand-built models. It is shown that chirality is a topological element (dispiration) of the network, based on hexagonal rings, and that it extends over a finite range. Regions of opposite chiralities can be nucleated in the same network, separated by a boundary whose main features are given. This boundary can serve as a nucleus to grow chiral networks.