Chalcedony from Essex County, New Jersey, USA
USA | |
| [var. Agate] 59-157-183 (1984), Peters, Joseph J. NJ Geol. Survey Bull. #64 (1960), Mason, B. Rocks & Min.: 18:332-333 (1943), Drake, H.Y. Mins. of NYC & Its Environs, NY Min. Club (1931), Manchester, J.G. |
| [var. Agate] Rocks & Min.: 10:43. |
| Cummings, W. L., 2007, Personal communication |