We have run out of stock for this item.
Sodalite from Greenland that has been worn and tumbled by water and glacial activity.
Similar to the recently popular Yooperlite rocks, Greenland has its own Yooperlite rocks (but we just call them sodalite). Glaciers eroded sodalite out of the Ilimaussaq Complex and carried them towards the ocean, grinding and polishing all the way. Many were deposited in the glacial moraines near the village of Narsaq. Lots more can be found on the pebble beaches in the fjords cutting through the complex. The sodalite is brightly fluorescent under LW (365nm).
When split, many exhibit a strong tenebrescence after exposure to shortwave (SW) UV (see animation below). This is (so far) a Greenland exclusive. Minerals include sodalite, arfvedsonite, aegirine, eudialyte, and probably a few others, all in a syenite type rock.
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.
A major component of rock collecting (for us) is simply getting out in nature. A buddy dragged us out to a very remote area here in middle Tennessee to hunt for fluorescent green agate. Since we consider ourselves pure "Glow Hounds" we weren't anticipating any glow rocks, just the beauty of the area, but we brought our UV lights anyway.
