Hackmanite is a rare, UV-reactive mineral belonging to the Sodalite family. Currently, much of the mineral is being sourced from Pakistan, Afghanistan and India. It is typically formed in low-silica and alkaline magmas. Hackmanite is known for its ability to show purple tenebrescence (changes color in sunlight) upon UV and X-ray exposure. Hackmanite has been reported to show “an afterglow of several seconds” or “prolonged afterglow of white light”. Such an afterglow is often called phosphorescence by mineralogists, but here we use the term persistent luminescence (PeL) because the afterglow is not due to forbidden transitions (as is the case with phosphorescence) but it is caused by the trapping of charge carriers and their slow release. Therefore, persistent luminescence (PeL) can persist for up to hours. In Hackmanite, PeL is not present in every natural specimen. Hackmanite is not water safe and great care should be taken when cleaning your specimen.
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