Northwestern Mine, Keweenaw Co., Michigan

10 x 4.8 x 3.5 cm
The third dimension listed includes the curve of the specimen; otherwise, the specimen is 1.7 cm at its thickest.
3.9 x 1.9 x 1.4 in

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Ex. A. E. Mineral Museum

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.

Condition: Good

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