Sodalite (Hackmanite) - Greenland
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A museum quality piece of deeply tenebrescent hackmanite. Brightly fluorescent under all wavelengths, the hackmanite also displays some phosphorescence which is unusual. Most areas of green fluorescence is the typical uranyl activated mineral found on Ilimaussaq rocks. First it’s very tenebrescent, darkening to a purplish hue after exposure to shortwave UV light. The striking tenebrescent purple hue against the white matrix provides a perfect example of tenebrescence. Combine this with the size of the specimen and you’ve got a superb piece for a collection.
The animation below shows the extreme color change (tenebrescence) after exposure to longwave and shortwave UV.
Willemite, Calcite, Fluorite from the Garpenberg Mine in Sweden
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.