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Chalcocite with Silver, Calcite
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Rich masses of chalcocite throughout a calcite matrix with minor silver. Collected in 1997.The Isle Royale Mine, located in Houghton County, Michigan, began operations around 1852 during the early Keweenaw copper boom, experiencing various periods of inactivity before closing permanently in 1931. Geologically, the mine is situated within the Keweenaw Peninsula's Portage Lake Volcanics series, where native copper deposits occur primarily in amygdaloidal basalt flows and conglomerate beds, most notably the Isle Royale amygdaloid lode.
Product details
SpeciesSilver, Chalcocite, Calcite
SizeSmall Cabinet
Dimensions8.0 x 8.0 x 2.5 cm
Added on09/17/2026
LocalityUSA, Michigan, Keweenaw County
Current owner
Unknown Owner
- Acquired
- Sep 2026
Previous owners
| Date | Collector | Acquisition price |
|---|---|---|
| — | Weinrich Minerals | Not disclosed |
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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.Regional guide
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