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Figure 4
Example tomographic data acquired from beamline 2-BM at the Advanced Photon Source. A sequence of images representing vertical slices (parallel to σ1) from reconstructed volumes of Volterra alabaster is shown in (A)–(E) (scale bar = 250 µm). Initially, pristine alabaster (A) begins to dehydrate from gypsum to bassanite [speckled area in (B)] which weakens the sample, promoting shear failure [(B) and (C)]. Further dehydration [(D) and (E)] both creates additional porosity and, apparently, leads to `healing' of the plane of shear failure (E).

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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