Psilomelane from Tuolumne County, California, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 68. Day, David T. (1885), Manganese: Mineral Resources US, 1883-84: 554 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |