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Zircons with strong absorption lines

Three of six cut zircons (Zr Si O_4) from my collection. These show the strongest absorption lines (from uranium). The largest of the three, a green Burmese stone, exhibits detectable radioactivity with my Geiger counter.

The luminescence spectra contain mostly rather diffuse bands (compared to the other three zircons). Most of these bands correspond to the groups of sharper emission lines seen in the weak absorption stones. The green stone appears to show a self-absorbed luminescence spectrum - particularly close to 650nm.

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