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Figure 4
Silicon ions (blue, green and yellow circles) of α-quartz in xy-projection in space group P3221 (blue: z = [{2 \over 3}]; green: z = [{1 \over 3}]; yellow: z = 0). These form a 2D framework characterized by two parameters, L (equilateral triangle side-length) and Δ (deviation of angle from 60° in constitutive triangle of hexagonal void). Lengths p and q show the unequal radii of the hexagonal voids, with p < q (taken from Figure 12 of Reifenberg and Thomas, 2018BB27).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 77| Part 3| June 2021| Pages 427-440
https://doi.org/10.1107/S2052520621002717
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