• 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

1,763 questions

3,104 answers


7,836 users

Any ideas what this purple rock may be?

0 votes

I found this rock in the Clackamas River, Oregon. This river runs from Mt. Hood. It has some quartz in it but not much. I think it is metamorphic in nature. It is a nice purple with red rock. I am sure it is volcanic in origin. It is very heavy. I haven't tried any tests on it. Any ideas?

asked Aug 31 by trishberrong (250 points)

1 Answer

0 votes
Rhyolite maybe, volcanic rock.
answered Aug 31 by Weasel (37,800 points)
Thanks, will do research on rhyolite

Related questions

0 votes
6 answers
asked Apr 6, 2014 by Renee (240 points)
0 votes
1 answer
0 votes
3 answers
0 votes
1 answer