Pyrite from Delaware County, Pennsylvania, USA
USA | |
| Colflesh, S. (2010) Mineral News, 26, #5, 2. |
| Rocks & Min.:59:109-120. |
Gordon, "Mineralogy of Pennsylvania," 1922 p. 195. | |
| A.Mathauser collection |
| Rocks & Min.: 59:109-120 & 62:176-178. |
USA | |
| Colflesh, S. (2010) Mineral News, 26, #5, 2. |
| Rocks & Min.:59:109-120. |
Gordon, "Mineralogy of Pennsylvania," 1922 p. 195. | |
| A.Mathauser collection |
| Rocks & Min.: 59:109-120 & 62:176-178. |
Morton Homestead, Prospect Park, Ridley Township, Delaware County, Pennsylvania, USA