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Figure 1
(a) Crystalline samples viewed between (partially) crossed polarizers of (i) a single crystal, (ii) a twin showing a re-entrant angle and different optical transmission on either side of a twin plane, and (iii) an aggregate, also showing re-entrant angles. The twin and aggregate could probably be cut with a razor blade to yield suitable single-crystal fragments. (b) An example of multiple domains within a two-individual twin for which microsurgery would be unlikely to yield a usable single-crystal fragment. Note: these images are representative examples from the author's archives and are unrelated to the three cases discussed in depth in this paper.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 77| Part 5| May 2021| Pages 452-465
https://doi.org/10.1107/S205698902100342X
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