Chalcopyrite is the same chemical formula as Pyrite, but with added Copper. It has a bright, brassy colour compared to Pyrite which tends to be more dull, and is often acid treated to form the colourful crystals sold as 'Peacock Ore'.
3.5 - 4
UK, China, Romania, Mexico, USA
Crown, Third Eye, Throat, Heart, Solar Plexus, Sacral, Root