Copper - image 1
Copper - image 2
specimen video

Copper

Unknown Owner
A neat example of what is known as a copper skull, this where crystallized copper formed around amygdules. This one is quite unusual as it exhibits multiple skulls instead of usually what one sees is just a single skull. The specimen comes with a previous label from the A. E. Seaman Mineral Museum of Michigan Tech collection as seen at the end of the video.

Product details

Species
CopperAbout Copper →
SizeCabinet
Dimensions12.0 x 11.0 x 10.0 cm
Added on10/16/2025
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →

Known provenance

DateCollectorAcquisition price
01/2026Unknown Owner$2,500.00
—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.