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Two prominent, blue-green apatite crystals on white matrix. The larger, elongated crystal forms the centerpiece, with a smaller crystal alongside it. Under midwave UV, the apatite displays a bright violet-blue fluorescence. Franklin apatite is known for its varied fluorescent responses.
Ex. Richard C. Bostwick Collection.
This specimen originates from the renowned collection of Richard C. “Dick” Bostwick, one of the foremost authorities and collectors of fluorescent minerals from Franklin and Sterling Hill, New Jersey.
Beginning his collection in 1960, Bostwick devoted more than six decades to studying, documenting, and preserving the extraordinary fluorescent mineralogy of this historic mining district. His connection to Sterling Hill extended underground. Bostwick worked at the Sterling Hill Mine during the 1970s, giving him firsthand access to and knowledge of the mines.
They were nicknamed "Yooperlites" which is derived from the name “yooper”. A yooper is a nickname for the Upper Peninsula natives and these fluorescent stones quickly gained fame. After data was published on these fluorescent stones, it was discovered that sodalite is the actual true mineral that is fluorescing orange.
365nm UV light is often called "blacklight". Before the advent of longwave UV LEDs, blacklight fluorescent tubes, (the kinds used in hippie days to light up psychedelic posters) were the standard longwave UV light for our hobby. They were not very powerful but they did light a large area.
Enter 365nm UV LEDs
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.
