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Help identify grey rock glows bright green for minutes under sunlight or flashlight found in Texas

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We found a heavy hand sized rock- white grey like limestone - in central Texas while we were hiking just after sunset.  It was glowing dim green. We took it home to investigate. It glows bright green with a flashlight and lasts for several minutes. If you use a lighter, you can also see the rock glow bright green where you place it.  The lighter doesn't seem to cause any damage. Three out of the five sides glow, the bottom and 1 side do not. What could it be? Glows like Willemite but doesn't require a UV light to get it to phosphoresce for several minutes. There seems to be a thin layer which can flake off and glows green. Definitely not a painted rock!  Tried to upload a pic but couldn't figure out how to make it work.
asked Sep 4, 2017 by sophiag (120 points)

1 Answer

0 votes
Sophia, use the toolbar, the bottom one, the sixth box from left to right, the first icon. It gives you three ways to load, follow the prompts and you should be golden. Very interesting. There are a good amount of rocks which are luminescent. I look forward to seeing it.More problems and I will try to navigate it more thoroughly for you.
answered Sep 12, 2017 by Weasel (58,930 points)