Chalcedony from selected localities.
USA | |
| [var: Agate] Rosemeyer, T. (2007) The Kearsarge: Copper-bearing Amygdaloidal Lode. Houghton and Keweenaw Counties, Michigan. Rocks & Minerals: 82(4): 276-297.;Rosemeyer, T. (2011) New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals: 86(3): 205-227 |
| [var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson |
[var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson | |
[Agate var: Lake Superior Agate] Brian Cowger |
Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA