Silver, Copper - image 1

Silver, Copper

$450.00

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C

Collector’s EdgeFeatured
753 for sale·296 sold
A neat example of a copper/silver ‘half-breed’, consisting of silver and copper intergrown. This is a classic for Michigan copper country, and this is a neat example with a peculiar mining artifact – what appears to be an indent from a rock hammer right in the middle of the specimen! A great conversation piece.

Product details

Species
Copper, SilverAbout Copper →
SizeSmall Cabinet
Dimensions2.5 x 7.5 x 5.0 cm
Listed on04/08/2026
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →
SKU83783

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.