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Photochromic scapolite

This scapolite is surrounded by a hauyn/lazurite coating. It is made photochromic via X-ray irradiation. These specimens have the typical vibronic S2- fluorescence under UV-A (365 nm LED), but only show a faint fluorescence due to structural defects in the UV-C (275 nm LED). These specimens lack the typical REE UV and blue and the red Fe3+ fluorescence.



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