$500Median
608Sold (12 mo)
$70Last sale
Copper (twinned)
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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.
Product details
SpeciesCopper
SizeLarge Cabinet
Dimensions15.2 cm
Added on02/13/2026
LocalityUSA, Michigan, Quincy Mine
Publications
- Mineralogical Record Mineral Collection University Of Delaware page 52
Previous owners
| Date | Collector | Acquisition price |
|---|---|---|
| — | Gene Schlepp | Not disclosed |
| — | Northwestern University | Not disclosed |
| — | Lazard Cahn | Not disclosed |
| — | George L. English | Not disclosed |
| — | Sir Arthur Russell | Not disclosed |
Learn more
Mineral guide
Learn about Copper
native copper with spinel-twinned crystals and arborescences; notable from Lake Superior, Itauz, Dongchuan, Corocoro, prized for color and localities.Regional guide
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