Peacock copper, bornite, - from Mexico. Grab Bag

Peacock copper, or bornite, (sometimes incorrectly referred to as Chalcopyrite) is a copper iron sulfide mineral known for its vibrant, rainbow-colored iridescent tarnish, which develops upon exposure to air. 

This is a "grab bag" item.  That means we will pick one from our available inventory and send it to you.  Pictures of the actual material is shown. No two specimens are alike.