3" Copper Ore Slice - Michigan

This is a 3" wide, natural formation of copper that has been cut into a slice and polished to a mirror like finish. The exterior has been coated in an epoxy to assist with preservation of the copper. Comes with an acrylic display stand.

Native copper is an uncombined form of copper which occurs as a natural mineral. Copper is one of the few metallic elements to occur in native form, although it most commonly occurs in oxidized states and mixed with other elements. Native copper was an important ore of copper in historic times and was used by pre-historic peoples.

Native copper occurs rarely as isometric cubic and octahedral crystals, but more typically as irregular masses and fracture fillings. It has a reddish, orangish, and/or brownish color on fresh surfaces, but typically is weathered and coated with a green tarnish of copper carbonat.

The mines of the Keweenaw Peninsula in Upper Michigan were major copper producers in the 19th and early 20th centuries, and are the largest deposits of native copper in the world. Native Americans mined copper on a small scale at this and several other locations, and evidence exists of copper trading routes throughout North America among native peoples, proven by isotopic analysis. The first commercial mines in the Keweenaw Peninsula (which is nicknamed the "Copper Country" and "Copper Island") opened in the 1840s.
FOR SALE
$25
DETAILS
SPECIES
Copper
LOCATION
Michigan
SIZE
3" wide
SUB CATEGORY
ITEM
#66382