Hackmanite’s Fluorescence and Tenebrescence

In this video, you will see the magical Fluorescence, Tenebrescence in these nice Hackmanites from Badakhshan Province, Afghanistan.
Hackmanite is a rare variety of the mineral sodalite. It contains trace amounts of sulfur, which causes the color of the stone to change after exposure to light. In gemological terms, this phenomenon is referred to as tenebrescence or reverse photochromism. Hackmanite can be found in several countries, including Canada, USA, Brazil, Russia, Greenland, Myanmar and Afghanistan. The mineral is often encountered as very small crystals or as translucent to opaque aggregates, often intergrown with other minerals. Rough crystals that will cut large stones are occasionally found but are scarce. Very fine, gem-quality hackmanites that combine good transparency, fine color and show strong tenebrescence are considered very rare.
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Source: chriszabriskie....
Artist: chriszabriskie....

[@spacemandan7971]

All i see is flourescence, you keep flashing the light on and off of the gems, instead of leaving it on and letting them change color, which is the magical tenebrescence.

[@ItxFarmankhan.123]

Da natural de?

[@PrettyLittleGem]

Yes

[@ItxFarmankhan.123]

@@PrettyLittleGem how much price per carat.