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Figure 1
(a) Satin spar rods with `cat's eye' lustre perpendicular to the apparent fibre axis (marked by the arrow). (b) SEM image of the cutting cross-section of satin spar; ⊙ indicates that the fibre axis points towards the reader. Most fibres exhibit cross-sectional diameters between 5 and 50 µm. Note that we deliberately imaged the slightly damaged margin of the sample disc where individual fibres peel off, which makes their 3D shape visible. In our XRD analyses, the undamaged, smoothly polished disc centre was examined.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 57| Part 2| April 2024| Pages 240-247
https://doi.org/10.1107/S1600576724000529
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