🔎 UNIDENTIFIED What is it?

[SCUFFLES]

I found this thing and it glows in the dark with a normal flashlight and a UV flashlight and it still glows for a while even after the flashlights have been turned off.

 

[Mackaydon]

A fluorescent mineral.
Don in SoCal

 

[Randawg72]

The interwebs says that Willemite glows with a brilliant neon green under ultraviolet (UV) light.
Other minerals that glow green include hyalite opal and some varieties of adamite(?).
...Or it could just be a Kiwi flavored Jelly Belly. 😉

 

[SCUFFLES]

There are over 500 fluorescent minerals. I’m guessing that it might be opal because it is fluorescent and phosphorescent.

 

[NVNutcase]

Store bought . We bought a bag of these to put around our yard.

 

[Red-Coat]

Lots of minerals exhibit an afterglow in the dark (phosphorescence) for a while after exposure to a bright light. The most common one that can glow green would be chalcedony. The afterglow is caused by trace impurities of uranyl ions, often found in chalcedony originating from volcanic hydrothermal deposits.

Calcite impurities in chalcedony can cause a blue, white or pale yellow afterglow and organic impurities can cause a yellow or white afterglow.