(Nature Materials 5, 931–932 (2006) doi: 10.1038/nmat1792

In this News & Views article, Fig. 2 was missing; it should have appeared as shown here. Both Figs 1 and 2 should also be credited to M. M. J. Treacy.

Figure 2: Zeolites that don't like symmetry.
figure 1

The framework of a zeolite known as AST. a, The idealized cubic form with the corner-sharing tetrahedra visible. b, The framework relaxes into a tetragonal framework (with lower symmetry) by tilting the tetrahedra. For both a and b, the view is down the tetragonal c axis and the tetragonal unit cell is outlined. The tetragonal form has a wider flexibility window than the cubic.

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