Fairly large Copper crystals which are completely covered with a thin layer of Tenorite which is likely an alteration. There are also a few areas with a druze of orange colored Adularia (K-Feldspar) crystals.
Flaws: There is one place where there is a concave area which looks as if it could be a chisel mark. However, the black Tenorite is not scraped away.
This mineral is also found in the following galleries: Minerals From Michigan | Copper | Tectosilicates | Oxides and Hydroxides | Minerals Priced Between 50 and 99 Dollars