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Figure 2
Crystal structures of (b) bixbyite and (d) braunite with the cation layers labelled as described in the text. In (a) the 8a site of bixbyite is coloured blue, while the 24d site is coloured grey. In (c) the corresponding sites in the braunite structure have been coloured equivalently to ease comparison of the (i) [A_1'] and A1 layers, and (ii) [A_2'] and A3 layers. The presence of silicon in the braunite Bi is indicated by black spheres in (d).

IUCrJ
Volume 9| Part 4| July 2022| Pages 523-532
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522006315