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Figure 3
2D scanning XRD/XRF of a slice from club 6. (a) Overview Ca K XRF map (scale bar 1 mm, colour gradient bar shows the Ca content). White boxes mark region 1 (left) and region 2 (right) scanned at higher in-plane resolution. (b) High-resolution Ca K XRF map of region 1 (scale bar 20 µm). (c) Mean diffraction pattern of region 1 (blue) with a model diffractogram of calcite (black). Insets show the chitin diffraction peaks. The peaks marked by (hkl) were used for further analysis of the orientation and spatial distribution of calcite [reflections (104), (110) and (202)] and chitin [reflections (110) and (013)].

IUCrJ
Volume 10| Part 3| May 2023| Pages 288-296
ISSN: 2052-2525
https://doi.org/10.1107/S2052252523002075