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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..
The Garpenberg mine is located in Bergslagen, a very old mining area in the southern part of Sweden.
The mine is very active today and is one of Europe's most progressive underground mining operations. Collecting is not possible, and the few specimens that reach collector's hands are highly prized. The mineralogy is quite similar to that of Franklin NJ.
