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Figure 2
Framework topology of K-paracelsian and a related feldspar represented by connected T sites. (a) and (b) topology of K-paracelsian. Red planes are used to emphasize the double-crankshaft chains and the black spheres represent potassium positions. The structure is shown in projection parallel and perpendicular to the double-crankshaft chains, respectively. (c) K-paracelsian cages occupied by potassium atoms. All cages are equivalent by space group symmetry (Pnam). Colours have been added to emphasize individual cages. (d) Framework topology of the feldspar mineral microcline in projection parallel to the twisted double-crankshaft chains.

IUCrJ
Volume 6| Part 1| January 2019| Pages 66-71
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518016111