Applying to join this forum, you HAVE to activate your membership in YOUR email in the notice you recieve after completing application process. No activation on your part, no membership.

Please login or register.

Login with username, password and session length
Advanced search  


Welcome new members & old from the Lapidary/Gemstone Community Forum. Please join up. You will be approved after spam check & you must manually activate your acct with the link in your email

Congratulations to Bobby1 and his Brazilian Agate Cab!

Another cabochon contest coming soon!

Pages: [1]   Go Down

Author Topic: Slightly hot, unknown specimen  (Read 87 times)

0 Members and 1 Guest are viewing this topic.

R.U. Sirius

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 264
  • asleep at the grinding wheel
Slightly hot, unknown specimen
« 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.


  • Full Member
  • ***
  • Offline Offline
  • Posts: 149
Re: Slightly hot, unknown specimen
« Reply #1 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.
Pages: [1]   Go Up

Page created in 0.06 seconds with 24 queries.