Quartz from Copper Falls, Eagle Harbor, Keweenaw County, Michigan, USA
USA | |
| USGS PP144 |
| Frank Karasti |
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. | |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. |