The consequences of the resulting perturbed symmetry and of the non-equivalence of the bridging m-OH groups in the Al 2 OH fragments were pointed out (complexity of the n(Al 2 O-H), d(Al 2 OH) and g(Al 2 OH) bands). The vibrations of the PO 4 and HPO 4 groups could be separated. Some aspects of the vibrational behaviour of the AlO 2 (OH) 4 units and of the layers composed therewith were addressed. The translational modes of the interlayer cations Ca 2+ and Sr 2+ could be observed; the findings support the suggested displacement of Ca in crandallite.
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