native copper - set of untreated float copper specimens from Michigan's upper peninsula
Float copper or drift copper is native copper that was plucked from the bedrock by the continental glaciers. When the glaciers melted at the end of the Pleistocene, pieces of native copper were left behind, buried in the glacial drift, the rock material that had been carried in the ice and which was dumped as a moraine sheet when the ice front retreated.
These pieces of native copper were collected from the glacial drift in Houghton County, in Michigan’s upper peninsula, using a metal detector. The surface alteration caused primarily by oxygenated groundwater, has been left natural. Density will identity these to students as a metal, Since copper does not readily combine with other elements, the surface tarnish is thin and can be scratched through.
Select a set: When more than one specimen is shown, you can select a particular specimen by telling us what is in the photo with it, a black and silver pen, a black mechanical pencil, or one of those plus some number of coins, or you can let us make the selection.
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