Biotite from selected localities.
USA | |
| Notes by Jeremy Zolan |
| Gurlt, Adolf. (1894): On a remarkable deposit of wolfram-ore in the United States. Transactions of the American Institute of Mining Engineers: 22: 236-242.; Shannon, Earl V. (1921a): The Old Tungsten Mine in Trumbull, Connecticut. American Mineralogist 6:126-128. |
| Januzzi, 1976. Mineral Localities of CT and Southeastern NY State |
J. Zolan Field Observation | |
| Ryerson, Kathleen H. (1972) Rockhouns Guide to Connecticut |