Plancheite from Pima County, Arizona, USA
USA | |
| Thomas, William J., Gibbs, Ronald B. (1983) Famous Mineral Localities: The New Cornelia Mine, Ajo, Arizona. The Mineralogical Record, 14 (5) 283-298 Gilluly, J. (1937), AZ Bur. Mines Bull. 141: 68-75, 79-81. |
| Luetcke, Rolf (n.d.) Personal communication. |
Omega Mine, Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA