Detailed Description

Unique shape Uranium glass cullet (has Uranium Oxide Diuranate added) to cause the glass to be fluorescent and slightly radioactive. The rock or cullet you will receive will glow a brilliant see-thru green under UV light from LEDs or UV flashlights in the 365 to 420nm range. Our G17126 10mm UV LED is an excellent choice to light these up. Each of these rocks emit enough radiation to be detected by our Firework Fountain Geiger Counter CJ304, Sensitive Geiger Counter - G21276A and the World's Smallest Geiger Counter - C7061 - All Sold Separately. Each rock cullet is at least 0.80" long x 0.20" tall or larger. Some may have slightly darker different color areas inside and all are unique. Please be careful when handling these as they may have sharp points or edges.