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Figure 2
All aragonite crystals shown here were produced in-house. When grown from pure aqueous solutions (left), the pure {001} basic and pseudo-hexagonal pinacoidal forms do not show any re-entrant or salient angles. Otherwise, in the presence of lithium (see Table 2[link]) the {001} pinacoids show welding between individuals composing the aggregates (centre and right). The complex twin (right) probably indicates the spiral origin of the fully closed aggregate [see also Aquilano et al. (2019BB1)]. In the last two cases, it is impossible to distinguish between twinned and homo-epitaxial contributions, along with the {110} and {010} indexing of prismatic faces, since the measurement of the angles is not feasible in the SEM images.

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