Feldspar Group from selected localities.
USA | |
| Observed, David S. Bernstein- February of 2012 |
| The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 90. |
| Rhein property |
The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 71. |