Chalcedony from selected localities.
USA | |
| [var: Agate] Larry Maltby; Heinrich/Robinson (2004) Mineralogy of Michigan, see Quartz, Keweenaw Co. |
| [var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson |
[var: Agate] Bornhorst, T.J., Rose, W.I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Field Trip Guidebook. Institute on Lake Superior Geology Annual Meeting, Houghton, Michigan: 40(2). 185 pages. | |
[var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson | |
[var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson | |
[var: Agate] Yalmer Primeau collection |
Lakeshore traps, Eagle Harbor, Keweenaw County, Michigan, USA