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Figure 1
View of the unit cell of the twin lattice of melilite along the c axis. The atoms of type X (mainly calcium in our example) are coloured light blue, the atoms of type Y (mostly magnesium) in orange, the atoms of type Z (mainly silicon) dark blue and the oxygen atoms are in red. (a) View of all atoms in the cell and (b) the quasi-restored atoms.

IUCrJ
Volume 1| Part 1| January 2014| Pages 39-48
ISSN: 2052-2525
https://doi.org/10.1107/S2052252513026493