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Let's Rock => Mineral Specimens => Topic started by: R.U. Sirius on April 10, 2023, 06:56:07 PM

Title: Slightly hot, unknown specimen
Post by: R.U. Sirius on April 10, 2023, 06:56:07 PM

I bought an affordable, made in the USA Geiger counter so I can go through my box of Dontknowite pieces I've accumulated over years. Only found this one radioactive specimen, counting in the ~100 CPM range.

Can anyone here make a guess as to what it might be? Looks like there are at least three different minerals in there.

Title: Re: Slightly hot, unknown specimen
Post by: AgateLicker on April 11, 2023, 02:10:52 PM

Looks like medium temperature pegmatite feldspars with intermittent uraninite to me. The "rusty" spot is an indicator of isotopic decay.