Biotite from selected localities.
USA | |
| "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998 |
| Bastin, Edson Sunderland (1911) Geology of the pegmatites and associated rocks of Maine, including feldspar, quartz, mica, and gem deposits. United States Geological Survey, Bulletin 445, 152 pgs. |