Sphalerite from selected localities.
USA | |
| Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 203; Economic Geology; 1 August 1971; v. 66; no. 5; p. 777-791 |
J. Wingard, Personal Observation 3-27-04 |
USA | |
| Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 203; Economic Geology; 1 August 1971; v. 66; no. 5; p. 777-791 |
J. Wingard, Personal Observation 3-27-04 |