Hackmanite cabbing rough from Afghanistan.  Hackmanite is sulfur-bearing sodalite.

This material is deeply saturated purple and blue and glows BRIGHT red under UV.  The material darkens further under UV temporarily, a process known as tenebrescence.  

Tenebrescence is the ability of a mineral to change color when exposed to light, in this case a UV light. The phenomena will reverse itself after a few minutes to a few hours and can be repeated again and again.

20 pieces / 50.72 total grams 

Estimated Value: $125 - $135

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