Hackmanite is a rare sulfur chloric sodium aluminum silicate member of the Sodalite family. It crystallizes in the form of masses, cubic and octahedral formations. This is one of the very few minerals that is tenebrescence (changes color when exposed to sunlight), as well as UV reflective.
Fun to display between uranium glass or other fluorescent items.

Lights up under 395 and 365 uv licht.

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