Mineralien / Minerals / Minerales > Fluoreszenz, Lumineszenz / Fluorescence, Luminescence

phosphorescent character in uranium mineral?

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jennifercindrich:
I want to thank you ahead of time for any help or suggestions!!

I was wondering if anybody knew if there was a particular uranium mineral that has the quality of a very bright and long (6 seconds) phosphorescent characteristic?

I am questioning a possible uranium mineral with this quality. I use an UV systems SW super bright III. But It does this also with my cheap LW.

Let me also add that it fluoresces yellow under SW (using a Super Bright III) and LW and it Phosphoreces bright Greenish yellow.The colors in the third photo are not good and should show a lemon yellow and the phosphorescent should show a bright yellow green. My apologies.

The mineral in question forms a crust on calcite/dolomite. (see photo) I am in the Llano Uplift region in Central Texas.

Alcest:
Hi,

can you specify "Llano Uplift region"? Do you have any name of the mine/quarry the specimen comes from?

Google "didn't find" any informations concerning phosphorescent Uranium minerals.

Are you sure it's a U-mineral? Is it radioactive? A few Carbonates, Sulfates or Zn-minerals are known for phosphorescence.

jennifercindrich:
This is a newly discovered close-to-surface occurence on my property.

Here is information links to the district Llano uplift--https://en.m.wikipedia.org/wiki/Llano_Uplift
https://www.mindat.org/loc-9986.html

 I am not yet able to test the radioactivity but I doubt that a geiger counter will give a reasonable result, because the amount is so tiny that the radiation would hardly exceede the background radiation. I am already looking for a possibility to test it with a sczintilation device to get a spectrum that will prove (or not) uranium. Which is the exact reason for my question.

Alcest:
How 'large' are the specimens? Most geiger counters should give noticeable results if it's a U-mineral.

jennifercindrich:
The specimen shown above is about the size of a sand grain.

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