Take a look at this mineralized crystals specimen of colorful chalcopyrite and quartz from Missouri.  The rainbow oxidation on the chalco is sometimes called peacock ore, and is due to a natural phenomenon called thin film interference.  Be sure to check the video! From The Casteel Mine.  Shown mounted on 2” acrylic base with mounting putty, included with purchase. Measures 3 inches across at its longest span. As with all of our minerals no two pieces are alike, offering a truly one-of-a-kind gift for mineral collectors, Minecraft fans, geologists, and rockhounds. All minerals come with a miniature certificate of authenticity (label). 
 
More About Chalcopyrite
Chalcopyrite is a captivating mineral sought after by collectors for its dazzling metallic luster and distinctive brassy gold coloration.  It forms in a variety of crystal habits, from granular masses to distinct tetrahedral or dodecahedral crystals, often exhibiting iridescent hues of purple, blue, and green, caused by surface oxidation.  This mineral is a significant source of copper ore and is commonly found in hydrothermal veins alongside other sulfide minerals such as pyrite and sphalerite.  In fact, we often refer to it as pyrite with a copper molecule added.  They are commonly mistaken for each other and can be difficult to distinguish when they are found in geologic occurrences together