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Figure 12
A fragment of the modulated structure consists of 3 × 7 anorthite cells along the b- and c-axes. The modulation frontier is marked with red planes in the figure, indicating the mathematical inversion twin boundary positions. O atoms are omitted in the figure. Ca and Na atoms are shown as large spheres, with blue for Ca and yellow for Na partial occupancies. Al/Si atoms are shown as small spheres; occupancies for Si and Al atoms are shown with dark blue and light blue colors, respectively.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 72| Part 6| December 2016| Pages 904-915
https://doi.org/10.1107/S205252061601578X
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