Copper with Silver - image 1
Copper with Silver - image 2
specimen video

Copper with Silver

Unknown Owner
A mixture of native copper and native silver. These are known as halfbreeds.

Product details

Species
Silver, CopperAbout Silver →
SizeThumbnail
Dimensions2.3 x 2.3 x 0.4 cm
Added on09/19/2025
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →

Known provenance

DateCollectorAcquisition price
05/2026Unknown Owner$200.00
—Weinrich MineralsNot disclosed

Learn more

Silver
Mineral guide
Learn about Silver
native silver with wire, leaf, and dendritic forms, bright luster and patina; prized for rare isometric crystals and iconic localities in collections.
Silver
Regional guide
Silver from Keweenaw Peninsula, Michigan, USA
from Michigan’s Keweenaw Peninsula belongs to one of the most recognizable native-metal traditions in mineral collecting. It is the bright, white-metal counterpart to the district’s native copper: a soft, lustrous native element, Ag, occurring as dendritic sprays, herringbone aggregates, distorted crystals, plates, sheets, “spikes,” and intimate copper-silver intergrowths long known in the trade as “halfbreeds.” The appeal is immediate. Fresh silver from the Keweenaw has a cool, brilliant sheen that contrasts dramatically with reddish copper, white calcite, pale green prehnite, quartz, epidote, and the dark basaltic matrix of the Lake Superior copper district.