Quartz from Mineral Hill, Elwyn, Middletown Township, Delaware County, Pennsylvania, USA
USA | |
| [var. Rock Crystal] Joe Dunleavy (Pers. Comm.) |
Gordon's Mineralogy of Pennsylvania (1922) p. 191 | |
Stuart Herring |
USA | |
| [var. Rock Crystal] Joe Dunleavy (Pers. Comm.) |
Gordon's Mineralogy of Pennsylvania (1922) p. 191 | |
Stuart Herring |