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The purple ussingite on this piece fluoresces a very rare green color under UV. Ussingite from Ilimaussaq has three possible states: it can be non-fluorescent, fluoresce orange just like sodalite, or can fluoresce green as in this piece. The green fluorescing variety is by far the rarest. The rare green fluorescence comes from mixing with chkalovite. When ussingite fluoresces a more common orange, it is due to being mixed with Sodalite. The black crystals are non-fluorescent arfvedsonite.
There is tugtupite and polylithionite throughout the specimen as well..
First, an animation showing the difference between the UV flashlight we recommend (365nm filtered UV flashlight) versus unfiltered 395nm UV flashlights we see many folks carrying around at shows. So. much. visible purple light. We selected a bunch of rocks as a demonstration. Took pictures of them under his flashlight without the filter and then with the filter.
A major component of rock collecting (for us) is simply getting out in nature. A buddy dragged us out to a very remote area here in middle Tennessee to hunt for fluorescent green agate. Since we consider ourselves pure "Glow Hounds" we weren't anticipating any glow rocks, just the beauty of the area, but we brought our UV lights anyway.
