Quartz from selected localities.
USA | |
| [Chalcedony var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson |
Rocks & Min.: 21:664; 58:111.; Rosemeyer, T. (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District. Rocks & Minerals: 84(4): 298-323. | |
[var: Amethyst] Mineralogy of Michigan (2004) Heinrich & Robinson | |
[Chalcedony var: Agate] Mineralogy of Michigan (2004) Heinrich & Robinson | |
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| R&M 78:3 p180; Rosemeyer, T. (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District. Rocks & Minerals: 84(4): 298-323. |
Rosemeyer, T. (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District. Rocks & Minerals: 84(4): 298-323. | |
Rosemeyer, T. (2003) The Occurrence of Porcelaneous Datolite in Michigan’s Lake Superior Copper District – Part 1: Northern Keweenaw County and Isle Royale National Park. Rocks & Minerals: 78(3): 179. | |
[Chalcedony var: Agate] Yalmer Primeau collection | |
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
Copper Harbor, Grant Township, Keweenaw County, Michigan, USA