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Copper (twinned)
Copper (twinned), 15.2 cm, from the Quincy mine, Hancock, Houghton County, Michigan. The Keweenaw Peninsula of Michigan contained the largest deposit of native copper known. The Quincy mine operated from 1848–1945, mined to a depth of more than a mile and producing 424,000 tons of native copper. Previous owners include Baroness Angela Georgina Burdett-Coutts, Sir Arthur Russell, George L. English, Lazard Cahn, Northwestern University, and Gene Schlepp of Western Minerals. The specimen is currently owned by the University of Delaware.
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Species
Locality
Quincy mine, Hancock, Houghton County, Michigan, Keweenaw Peninsula, Michigan, southern shore of Lake Superior
Publications
- Mineralogical Record Mineral Collection University Of Delaware page 52
Added on02/13/2026
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Known provenance
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