Chalcocite from Union County, New Jersey, USA
USA | |
| Rocks & Min.: 42: 483-486. |
Rocks & Min.:13:75-79. | |
Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1) New York Mineralogical Club | |
| NJ State Geol. Ann. Rpt. (1906):151. |