Copper - image 1
Copper - image 2
specimen video

Copper

Unknown Owner
A wonderful well crystallized classic specimen from Michigan. This is in terrific condition all around. This excellent old-timer comes with several labels from the A. E. Seaman Mineral Museum of Michigan Tech collection. It is quite possible the specimen was at one time part of an early curator of this collection named Jean Petermann Kemp, and prior to that in the famous John T. Reeder collection.

Product details

Species
CopperAbout Copper →
SizeSmall Cabinet
Dimensions9.5 x 8.0 x 5.5 cm
Added on10/16/2025
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →

Known provenance

DateCollectorAcquisition price
01/2026Unknown Owner$6,000.00
—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.