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Now showing: Amygdaloidal basalt, Chalcedony
Amygdaloidal basalt, Chalcedony, Copper
St. Louis Mine Exploration, Schoolcraft Township, Houghton County, Michigan, USA
Amygdaloidal basalt, Chalcedony, Chlorite Group
St. Louis Mine Exploration, Schoolcraft Township, Houghton County, Michigan, USA
Amygdaloidal basalt, Chalcedony, Pumpellyite Subgroup
St. Louis Mine Exploration, Schoolcraft Township, Houghton County, Michigan, USA
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