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Figure 3
The most frequent twin law is ruled by A2 ≡ [010] ≡ twin axis, imposed by external symmetry. The brushite space group, Aa, does not allow the A2 ≡ [010] ≡ twin axis. Two examples of 2D-LC areas are drawn (dots and crosses refer to P and T lattices). Equivalent directions are represented with the same color.

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APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 4| August 2025| Pages 1220-1226
https://doi.org/10.1107/S1600576725005060
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