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Figure 6
Principal layers observed in the SFCA-III modifications containing band-like units of octahedra (layer 1) as well as so-called winged-octahedra and vierer-single chains of tetrahedra (layer 2). Layers are presented in projections perpendicular to the sheets. (a) and (b): monoclinic form; (c) and (d): triclinic form. Dark-gray octahedra represent pure [CaO6]-units, whereas the octahedra about the remaining M-sites are given in light-gray. Tetrahedra are marked in blue. For sake of clarity, the contour of a single winged-octahedron is highlighted with bold lines.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 75| Part 6| December 2019| Pages 1126-1136
https://doi.org/10.1107/S2052520619014380
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