Limonite from selected localities.
USA | |
| Chenoweth, W.L., (2014) The Geology and Production History of the Black Rock Point Nos. 1 and 3 Uranium-Vanadium Mines, Apache County, Arizona. Arizona Geological Survey Contributed Report, CR-14-B, 12 p. |
| Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 106. |