Quartz Var. Chalcedony, Gypsum - Nebraska
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A striking, bright two-colored chalcedony replacing gypsum specimen. The chalcedony glows a bright green under shortwave and midwave. The green fluorescence is activated due to trace amounts of uranium. The gypsum a nice, bright fluorescent yellow.
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.