Copper with Silver – Keweenaw County, Michigan


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This native copper/silver halfbreed is from Keweenaw County in the upper peninsula of Michigan, USA. There are dozens of mines in the county and they produced millions of tons of copper. Most of the deposits also produced silver which was sometimes a secondary growth on copper formations. When copper occurs with silver it is called a halfbreed. This specimen is primarily copper in the form of leaf like folds and euhedral crystals. It has several small secondary deposits of crystalline silver as shown in close up of photo two. This piece measures 1 15/16 x 1 3/8 x 3/4 inches or 49 x 35 x 19 mm.

Additional information

Weight6 oz

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