Photo sensitive rock

[Squirrel322]

We are up in Grand Marias in the upper peninsula of Michigan. A friend found this rock on the shore of Lake Superior. The rock is photo sensitive to UV light. After being exposed to the light from a VU flashlight it will continue to glow for a second or two. Anyone know what this is?

I have a short video of it but I don?t have a third party site to upload it to.

 

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[Charlie P. (NY)]

Yooperlite (I'm not kidding).

https://www.woodtv.com/news/michigan/the-upper-peninsula-has-glowing-rocks/


http://www.treasurenet.com/forums/rocks-gems/611674-yooperlite-portrait.html

 

[Squirrel322]

It’s not Yooperlite but it was found while looking for yooperlite!

Some of the Yooperlite I’ve found here-

 

[Dougie Webb]

I was thinking you meant "photosensitive" in the sense that, like me, it doesn't like to get photographed because it's not particularly pleasing to the eye.

I read out of context.

 

[Squirrel322]

I think the actual term i should have used is phosphorescence.


phos?pho?res?cence
/ˌf?sfəˈresəns/

noun
light emitted by a substance without combustion or perceptible heat.
"the stones overhead gleamed with phosphorescence"
PHYSICS
the emission of radiation in a similar manner to fluorescence but on a longer timescale, so that emission continues after excitation ceases.

 

[RustyRelics]

Hide it from the Roosians, they like glowing rocks.


lol, neat find!

 

[Lenrac2]

I learn something new every day!