Window onto a hidden structure in chrysoberyl

Note from 11 May 2017: I realise now that the small triangular yellow stone referred to here as a topaz is actually a chrysoberyl ( Be Al2 O4). This has been confirmed with a measurement of the refractive indices as 1.73, 1.74. The original text has been edited.

The laser (404nm) induced fluorescent zoning in a yellow chrysoberyl crystal imaged using the extended IR response of the Sony DSC F-717 'Night-Shot' mode. This gives better pixel sampling that a colour image. It was taken through a yellow filter to exclude the laser light.


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