Dims: 13.93x8.07x1.52" (35.38x20.51x3.86cm)
Wt: 12.06oz (342g)
Keweenaw Peninsula, Michigan, USA
This is an example of native copper that crystallized between layers of slate. While there are a few small areas which have a crystalline appearance, for the most part, the copper simply filled all available crevices in the host slate. Some bits of the black slate are still attached, especially where it fills sections between copper sheets and thus could not be removed. The copper itself is relatively thin, the thickest part measures 11.36mm - this is clearly a sheet of copper. Note that there are several areas where parallel copper sheets are attached and can flex. One of these is surprisingly loose. The copper has a perfect copper color, with a metallic luster, and while the surface texture is rather smooth in most places, there are areas with a granular texture.