Native copper occurs as a single element, it is an uncombined natural mineral. Copper is one of the few metallic elements to occur in native form naturally, it normally occurs in oxidized states or mixed with other elements. Native copper was an important ore of copper in historic times and was used by pre-historic peoples. These high quality specimens are from the famous Keweenaw copper deposits of Michigan, U.S.A. This is probably one of the most famous sites in the world for native copper ore, also being one of the largest too. Evidence of early mining by the native Americans exist, but commercial mining began around 1841 and finally stopped in 1968 when the last mine closed. It is estimated that around 5 million metric tonnes were extracted during this period. Our specimens have the classic dendritic, wiry or filiform characteristic of native copper. Available in a range of sizes, each specimens is supplied within a labelled card tray.