Silver, Copper - image 1

Silver, Copper

$2,500.00

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C

Collector’s EdgeFeatured
753 for sale·296 sold
A neat example of what is colloquially known as a copper – silver “half breed”, featuring inter grown crystals of copper and silver. This is a great example, with good crystallization and nice contrast. Includes two old labels – one from the famed Rice Museum.

Product details

Species
Copper, SilverAbout Copper →
SizeMiniature
Dimensions2.5 x 3.0 x 4.0 cm
Listed on12/24/2025
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →
SKU83605

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.