Copper (smelter product) - image 1
Copper (smelter product) - image 2
specimen video

Copper (smelter product)

Unknown Owner
A crystalline native copper specimen, this I am 99.9% certain is a smelter product. Interesting nonetheless, the previous label that comes with the specimen was describing this as a copper skull.

Product details

Species
CopperAbout Copper →
SizeSmall Cabinet
Dimensions9.0 x 7.0 x 4.5 cm
Added on10/29/2025
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →

Known provenance

DateCollectorAcquisition price
05/2026Unknown Owner$50.00
—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
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.