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Figure 11
Optical photomicrographs of a cross section obtained with a dark-field illumination from the guardian angel of La Gleize, with (a) visible reflected light and (b) UV reflected light. The cross section consists of four different layers (see supporting information for details). Some small orange grains are indicated by orange open circles.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 20| Part 3| April 2013| Pages 460-473
doi:10.1107/S0909049513004585
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