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Figure 5
Structure of the slices [d_{110}^{\rm Arg}] and [d_{020}^{\rm Arg}], both belonging to the [001] zone of aragonite: the {110} prism can show two profiles that are pseudo-symmetrically equivalent, generated from two types of building units (BU1 or BU2), whereas the {010} pinacoid, whose profile should be unique, is built by BU2 only. Note the strong similarity between the [d_{020}^{\rm Arg}] and [d_{110}^{\rm Arg}] slices. The meaning of the term `building unit' has been described previously elsewhere (Aquilano et al., 1997BB2) and the bonds that make each BU are illustrated in detail.

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APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 6| December 2023| Pages 1630-1638
https://doi.org/10.1107/S1600576723008208
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