Biotite from selected localities.
USA | |
| The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 75. |
| The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 85; New York State Museum Bull. Nos. 249-250 (Sep-Oct 1921), Magnetic Iron Deposits of SE NY, Clarke, John M.: 110. |
The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 81. | |
The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 69. | |
| Alfredo Petrov observations, 18-03-2009 field trip. |
Personally observed by Hershel Friedman. | |
| Rocks & Min.:7:81. |
| Alfredo Petrov observations |
Beechy Bottom Mine, Bear Mountain State Park, Rockland County, New York, USA