Copper from Keweenaw Peninsula, Michigan, USA - image 1
Copper from Keweenaw Peninsula, Michigan, USA - image 2

Copper from Keweenaw Peninsula, Michigan, USA

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An excellent grouping of thick robust large native copper crystals. This is complete all around and could display well from either side. In terrific condition. The specimen comes with an antique label from noted collector Fred Cassirer dating this piece to 1911. Label as seen at the end of the video.

Product details

SpeciesCopper
SizeMiniature
Dimensions5.0 x 4.5 x 2.0 cm
Added on11/15/2025
LocalityUSA, Michigan, Keweenaw Peninsula
Current owner
Unknown Owner
Acquired
Oct 2026
Previous owners
DateCollectorAcquisition price
—Weinrich MineralsNot disclosed

Learn more

Copper
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.
Copper
Regional guide
Copper from Keweenaw Peninsula, Michigan, USA
Keweenaw Peninsula copper - classic native copper from Michigan, famed for wiry arborescent sprays, sharp crystal faces, and historic mines prized by collector…
Locality guide
Keweenaw Peninsula
A collector's guide to Keweenaw Peninsula, USA: its geology, mining history and notable minerals, illustrated with the 209 specimens documented from this locality on EarthWonders.