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Figure 5
(Left) Fourier difference map calculated on an epidote data set refined dynamically before hydrogen-atom detection. The positive peak corresponding to the hydrogen of the hydroxyl group is clearly visible. Red points are O-atom positions, light-blue points are Al-atom positions. (Right) Fourier difference map calculated on a natrolite data set refined dynamically before the hydrogen-atom detection. Two positive peaks corresponding to the hydrogens of the water molecule are clearly visible. Red points are oxygen-atom positions, light-blue points are Al-atom positions, yellow points are Ca-atom positions.

IUCrJ
Volume 13| Part 2| March 2026| Pages 198-210
ISSN: 2052-2525
https://doi.org/10.1107/S205225252600045X