Smiley face created with uranium marbles being illuminated with a longwave ultraviolet (UV) light.
MARBLES for sale (eBay LINK or eBay LINK) at reasonable prices!!!
A piece of calcite (red) with a few specks for willemite (green) from the famous locality, Franklin, New Jersey.
A calcite geode from Durango, Mexico showing fluorescence under shortwave UV light.
Two uranium marbles illuminated with a UV LED that is for sale on eBay with FREE shipping: CLICK HERE. See something similar: CLICK HERE
CRACKLE marbles as seen HERE