When complex crystal structures are studied the visualization of the structures requires good structure models. The standard ball models help this visualization, but they are often either too expensive to purchase or too time-consuming to construct. Most structures, however, can be illustrated by polyhedral models, where the polyhedra represent the coordination polyhedra of the cations. Such models not only illustrate the linkage of the polyhedra and the whole structure, in many cases better than a ball model, but also offer possibilities for simple and inexpensive model construction techniques.

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