Native Copper, Tenorite

Right on time for the release of the new Mineralogical Record “Copper Country III” issue on the mines of Ontonagon County comes with superb group of very well-formed branching tetrahexahedral copper crystals on basalt matrix from the Caledonia mine near Mass City, Ontonagon County, Michigan, USA. Comes with a custom display base as well. Great piece! Mark Cross photo.