Spinel from Lehigh County, Pennsylvania, USA
USA | |
| The Mineralogy of Pennsylvania - 1922 Samuel S. Gordon pg. 209 |
| Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania |
USA | |
| The Mineralogy of Pennsylvania - 1922 Samuel S. Gordon pg. 209 |
| Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania |