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Figure 5
Data from gypsum dehydration experiments carried out at the TOMCAT bealine of the Swiss Light Source. Three images [(A)–(C) scale bar = 575 µm] representing vertical slices (parallel to σ1) from reconstructed volumes of Volterra alabaster show progressive dehydration of gypsum (mid grey) to bassanite (light grey) which grows as acicular crystals (A) surrounded by a dark moat which represents fluid-filled porosity. As bassanite crystals and their associated porosity impinge upon each other (B) the sample becomes mechanically weaker and begins to deform and collapse [(B) and (C)].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 6| November 2020| Pages 1681-1687
https://doi.org/10.1107/S160057752001173X
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