 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 1]](ra5093fig1mag.jpg)
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Figure 1
(a) The form of a generalized tetrahedron is defined by six parameters: fy, gx, gy, hx, hy and hz. These correspond to the non-zero components of its three bounding vectors in Cartesian coordinates. (b) A pseudocube is formed from the tetrahedron by inverting the four vectors from its centre-of-coordinates (large light purple circle) to oxygen ions, i.e. p, q, r and s, to form vectors −p, −q, −r and −s. Small red circles: pseudocube vertices occupied by oxygen ions; small blue circles: vacant pseudocube vertices (taken from Reifenberg & Thomas, 2018  ). |
![[Figure 1]](ra5093fig1.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
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