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Figure 9
(a) Convergent-beam electron diffraction (CBED) pattern of [Ca6][Pb9][(Si2O7)3(SiO4)3]□3 aligned along [210]. The absence of a mirror plane parallel to [[\bar 1]20] is clear from the non-equivalence of the indexed reflections and is consistent with trigonal symmetry. (b) and (c) are simulated CBED for P3 and [P\bar 6]. In hexagonal symmetry the mirror plane (vertical line) is evident as, for example, in the mirror relationship of 004 and 00[\bar 4] reflections.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 66| Part 1| February 2010| Pages 1-16
https://doi.org/10.1107/S0108768109053981
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