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Malachite, Copper, Volborthite
Knife River, St. Louis County, Minnesota, USA
Copper, Basalt
Knife River, St. Louis County, Minnesota, USA
Copper, Prehnite, Basalt
Knife River, St. Louis County, Minnesota, USA
Basalt, Prehnite, Copper
Knife River, St. Louis County, Minnesota, USA
Basalt, Prehnite, Copper
Knife River, St. Louis County, Minnesota, USA
Copper, Prehnite, Basalt
Knife River, St. Louis County, Minnesota, USA
Prehnite, Copper, Basalt
Knife River, St. Louis County, Minnesota, USA
Copper, Malachite, Cuprite
Knife River, St. Louis County, Minnesota, USA
Copper, Malachite, Cuprite
Knife River, St. Louis County, Minnesota, USA
Copper, Basalt
Knife River, St. Louis County, Minnesota, USA
Prehnite, Basalt, Copper
Knife River, St. Louis County, Minnesota, USA
Copper, Basalt
Knife River, St. Louis County, Minnesota, USA
Copper, Basalt
Humboldt Mine, Houghton Township, Keweenaw County, Michigan, USA
Quartz, Epidote, Copper
Mass Consolidated Mine, Mass City, Ontonagon County, Michigan, USA
Copper, Basalt, Epidote
Peninsula Mine, Ontonagon County, Michigan, USA
Silver, Copper, Epidote
Mass Consolidated Mine, Mass City, Ontonagon County, Michigan, USA
Silver, Copper, Epidote
Mass Consolidated Mine, Mass City, Ontonagon County, Michigan, USA
Malachite, Epidote, Basalt
Seneca No. 1 Shaft, Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
Amygdaloidal basalt, Chalcedony, Copper
St. Louis Mine Exploration, Schoolcraft Township, Houghton County, Michigan, USA
Basalt, Copper
Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
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