Tugtupite: typically bright red fluorescence under shortwave, orange under longwave. Only in some cases pink under midwave and long lasting white afterglow.
Famous also for its tenebrescence or reversible photochromism: it darkens to pink or red after exposure to UV light, and bleach back to its normal color (usually white or light pink, but also blue) with a strong white light.
Best (only?) samples are from the Ilímaussaq complex in Greenland.
SC1165 – Tugtupite from the Ilímaussaq complex, Greenland
Fluorescence under shortwave UV light.
Tenebrescence after exposure to UV light.
Fluorescent tugtupite in my collection:
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