3.8" Brilliant Peacock Ore - Mexico

Commonly referred to as Peacock Ore due to its brilliant iridescent coloration, this mineral is actually acid treated chalcopyrite. This acid treatment mimics a natural process that creates the much rarer copper-based mineral Bornite.

Chalcopyrite is a brass-yellow colored mineral and an important copper ore. When weathered, chalcopyrite loses its metallic luster, tarnishing and turning a gray-green color. When exposed to acids, that tarnish can develop a red, blue or purple iridescence.