Orthoclase from selected localities.
USA | |
| Volkert, Richard A., 2009, Kornerupine: A Rare and Unusual Mineral in the New Jersey Highlands, The Picking Table, v. 50 (1): 20-21. |
| The Minerals of NYC & Its Environs, NY Min. Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 71. |