Cuprite var Chalcotrichite on Copper

A thin cluster of densely packed dendritic copper with a generous helping of bright red Chalcotrichite needles, forming in tufts. The New Cornelia was the first large open pit mine in Arizona and operated from 1917 until 1983.

Locality: New Cornelia Mine, Ajo, Pima County, Arizona

Composition: copper and copper oxide