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Figure 1
Schematic representation of α and β, A5B3O18X2 apatite modules (assuming a hexagonal basal plane) that are related by [001]hex 60° rotation twinning. The principal idealization is that the AFO6 polyhedron is represented as a trigonal prism, but in real polysomes, twisting of the triangular faces through an angle φ creates metaprisms.

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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