Premium, A Grade (90-100% green coverage) willemite pieces from Franklin Mine, New Jersey. Select your size of Willemite.
Small: Approx. 1 1/4"- 1 1/2" 6-12 grams
Medium: Approx. 1 3/4"-2" 12-15 grams
Large: 2 1/2"-2 3/4" 16-20 grams
X-Large: 3" - 3 1/2" 21-45 grams
Each item has been carefully selected and inspected for quality. The photos showcase our collection, and while the unique piece you receive will resemble the stones shown, it will have its own distinct characteristics. Specimens sorted by weight do not come with specific size measurements, as each one has a different shape and mass.
Photos are shown under longwave (365nm) filtered UV, using our GloBox Mini light.
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.
