NATIVE Copper - image 1
NATIVE Copper - image 2
specimen video

NATIVE Copper

Unknown Owner
A magnificent cabinet specimen of Native Copper forming an elongated robust branch-like structure of thick chunky Copper crystals from the 'Copper Country' of the Keweenaw Peninsula of Upper Michigan, USA. Crude Copper crystals to 4 cm are roughly aligned parallel to the long axis of the specimen with a little attached white country-rock in the deeper crevices and especially on the base. The base is naturally flattened, so providing a stable surface to rest on. In general, the Copper has a rich, tarnished reddish-copper patina, but on those crystals that protrude more have a brighter lustre. The specimen is accompanied by an old Dr F. Krantz label. A beautiful Native Copper specimen from this most famous of localities.

Product details

Species
CopperAbout Copper →
SizeLarge Cabinet
Dimensions7.1 x 17.6 x 3.6 cm
Added on10/24/2024
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →

Known provenance

DateCollectorAcquisition price
11/2025Unknown Owner$3,000.00
—Crystal ClassicsNot 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
The Keweenaw Peninsula is the classic native-copper locality: a place where copper was not merely an ore mineral locked in sulfides, but the metal itself—dense, malleable, and often sculptural—precipitated as copper, Cu, in billion-year-old volcanic rocks. For collectors, “Keweenaw copper” is a category unto itself. It can appear as wiry arborescent sprays, thick hackly sheets, crystal groups with sharp metallic faces, rounded glacial float nuggets, massive vein copper, copper-filled amygdules in basalt, and copper in conglomerate where the metal laces between volcanic pebbles.