The distribution of aluminium within the lattice of a model calcium heulandite is considered. Significant segregation of Al to particular sites is noted with T2 being preferentially occupied whereas T4 has a low Al occupancy. T5 is also occupied, in contrast to earlier work on Na-clinoptilolite. The resulting distributions are also significantly different to previous work on Na-clinoptilolite, demonstrating the influence of the Si/Al ratio and cation species on the spatial arrangement of Si and Al in the framework.
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Ruiz‐Salvador et al. (1999) studied this question.