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Figure 1
The crystal structure of danburite under ambient conditions, viewed along the c axis. Green and blue tetrahedra represent BO4 and SiO4, respectively. The Ca atoms are shown in dark blue. The inset shows the coordination of a Ca atom, where the dotted lines correspond to bond lengths exceeding 3 Å.

IUCrJ
Volume 4| Part 5| September 2017| Pages 671-677
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517010612