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Sorensenite crystals are found in a ridiculously hard analcime matrix and - when you can find them - are usually found as a nodule, flat in the middle of a giant boulder, with no options to extract them. Power tools are required to drill, blast and saw to obtain matrix pieces of any size. Sorensenite has a creamy white fluorescence under shortwave UV and forms as blades in an analcime matrix. The green fluorescence is uranyl activated fluorescence in the analcime/lujavrite matrix. The matrix is mostly analcime, with pockets of crystals scattered throughout.
Of course, the tugtupite fluoresces a bright cherry red. Under longwave UV, the color of the tugtupite shifts to the typical salmon color.
Sorensenite is a beryllium tin silicate, extremely rare - found only in the Ilimaussaq Complex, Greenland - nowhere else in the world - a rarity in itself. Specimens are found in a couple of places within the complex but one area (Steenstrupe Field at the bottom of Kvanefjeld Mt. - a field of house-sized boulders) produces the best pieces such as this.
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.
