Unusual Natural Raw Chalcopyrite Bornite Silver Pendant from Mexico.
Bornite is a copper iron sulfide mineral with a chemical composition of Cu5FeS4. Chalcopyrite, marcasite, and pyrite are other sulfide minerals commonly associated with Bornite.
Location: Mexico
Size: 3.4 x 2.2 x 0.7 Centimeters with bail
Weight: 7.72 grams Combined

Interesting facts: Bornite is easily recognized because it tarnishes to iridescent shades of blue, purple, red, green and yellow. It is commonly called "peacock ore" or "purple copper ore" after these iridescent colors.