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Huge specimen of minor phlogopite, calcite, scapolite (marialite), hauyne or perhaps massive afghanite.
Lots of areas appear to be homogeneous blends of minerals. For example, under SW the bluish fluorescence in the lower left appears to be perhaps diopside, or possibly gonnardite. But under LW the blue fluorescence disappears and is replaced by dark orange from what is likely hauyne.
Under MW a large area of dull blue/white fluorescence towards the upper left.
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.
