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Figure 4
(a) Tetrahedron, (b) ball-and-stick and (c) graphical representations of the chain in astrophyllite-supergroup minerals viewed orthogonally to the c axis. Each tetrahedron in (a) is represented by a point (ball) in (b) and a vertex in (c), and all linkages between tetrahedra in (a) are represented by lines (sticks) in (b) and edges in (c) that connect each ball or vertex. Red and blue balls (points) represent 3- and 1-connected vertices, respectively. Dashed black lines show the 1T23T2 geometrical repeat unit (ng) in (a) and (b), and the 1V13V1 topological repeat unit (nt) in (c).

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ISSN: 2053-2733
Volume 78| Part 3| May 2022| Pages 212-233
https://doi.org/10.1107/S2053273322001747
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