• Register


Information for users from the old Q&A site
If you have an account from our old Q&A site, your account was transferred over, but you need to reset your password and confirm your email address.
Reset Password here
Confirm Email here

1,824 questions

3,209 answers

846 comments

9,085 users

What is the chemical makeup, likely origin, for my ~5 pound radioactive mica?

0 votes
What is the likely chemical makeup and likely origin, for my ~5 pound mica that is planar on an inch scale (not large sheets) and quite radioactive?
asked Nov 28 by M rowland (120 points)

1 Answer

0 votes
Not quite sure I get your question. Most mica isn't radioactive. Perhaps you are confusing it with a radioactive mineral with a micaceous appearance such as torbernite? Please elaborate on your question.
answered Nov 30 by hershel (47,740 points)
The rock has been called a biotite mica by a geologist in AZ.  it is not green so does not look like a torbernite.  The rock emits 2 mr/hr on contact and is decidedly mica and flaky.  The question is where could such a rock come from and how might the U or Th be incorporated into the mica?
Biotite mica is not radioactive. Perhaps it is included with a radioactive mineral such as zircon or uraninite.
 


...