• 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

2,237 questions

3,912 answers


128,184 users

Need assistance identifying this

+1 vote



This was found during recent construction at my property on Long Island in New York.


It’s about 1 1/2” at its largest point .  Just smaller than a golf ball.   It has several very shinny spots that are about the size of a pinky nail.  Some smaller shinny spots are present also.   


Thanks in advance for any help you can provide.






asked Oct 16, 2019 by John1960 (140 points)

1 Answer

+1 vote
Looks like iron pyrite, is it magnetic.
answered Oct 24, 2019 by Weasel (58,980 points)
Thanks for the information . No, it is not magnetic.  I had checked prior to posting my question.

Is this typically found in the NY/Long Island area?   I have been living and digging here for over 50 years and never seen anything like it.

The pictures don’t do it justice.  It’s actually very beautiful.   There is a small area that looks like a mirror.  Actually, more like aluminum foil.
John, this looks like muscovite mica. The flaky habit is indicative of mica, and there is mica north of the area that has been deposited in the area from glacial tilling which is present in Long Island.