Tugtupite Visible Spectra (250 - 750 nm)

Tugtupite, Na4BeAlSi4O12Cl, is an uncommon mineral which turns pink in strong sunlight and colorless when heated. The color orginates from minor amounts of sulphur in the mineral. The S4 molecule is believed to be the species responsible for the red color.
    see also the sodalite group

Link to references about the spectra of tugtupite

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last upgraded 12-July-2022