Quartz from selected localities.
USA | |
| [var: Smoky Quartz] Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 170 |
| Stuart Herring |
| Kenneth Moore |
USA | |
| [var: Smoky Quartz] Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 170 |
| Stuart Herring |
| Kenneth Moore |