Two blue zircons

Zircon spectra vary a lot - both the absorption and fluorescence lines. I have a few other examples that I have not examined in detail yet. The fluorescence lines here are from dysprosium and samarium at least. In these fluorescence spectra I have corrected for the yellow filter absorption down to 450nm. The purple (upper) and brown (lower) lines refer to the larger, round zircon.

Note that the sharp line at 808nm is the 404nm laser line in the second order of the grating diffraction. Also, I believe that the line at 695nm is a ghost or reflection due to the large amount of laser light entering the spectrometer during this observation.

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