• 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

1,624 questions

2,884 answers

717 comments

5,015 users

chalcopyritr

0 votes

What acid causes the tarnish on chalcopyrite resulting in the beautiful blue/green/purple coloration?

asked Aug 19, 2014 by aurorasrarfire (120 points)

1 Answer

0 votes

I think any strong acid will do it, but I think its commercially done with muriatic (hydrochloric) acid. I was once dissolving some stains off a prehnite with some minor chalcopyrite in a weak acid mix, and the chalcopyrite turned a beautiful iridescent blue.

answered Aug 21, 2014 by hershel (44,400 points)
 


...