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Figure 4
(a)–(p) Collection of slices at different hydration stages. The first slice corresponds to the sample in its dry starting condition. From the second slice to the last one 36 h of hydration have passed. As the hydration process takes place the initial hemihydrate grains progressively dissolve and small crystals of gypsum form and grow in an intricate network. (q)–(t) Zoom-in of a particular area of the sample, highlighted in (a), (c), (o) and (p), followed over the hydration reaction to show the dynamics of dissolution of two selected hemihydrate grains and the formation of gypsum crystals around them until the complete replacement of α-hemihydrate by gypsum.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 3| June 2023| Pages 660-672
https://doi.org/10.1107/S1600576723002881
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