$800Median
296Sold (12 mo)
$6,335Last sale
Updated 19h ago
Chalcocite with Silver, Calcite
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Ships from USA
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
Listed on09/17/2026
LocalityUSA, Michigan, Keweenaw County
SKU2062368
Current owner
WM
Weinrich MineralsFeatured
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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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