Fluorite from Berks County, Pennsylvania, USA
USA | |
| Ref.: Gordon, Samuel G. (1922), Mineralogy of Pennsylvania: 153. |
| |
| Gordon: Mineralogy of Pennysylvania, 1922 p. 159 |
USA | |
| Ref.: Gordon, Samuel G. (1922), Mineralogy of Pennsylvania: 153. |
| |
| Gordon: Mineralogy of Pennysylvania, 1922 p. 159 |
Oley Valley Quarry, Oley Township, Berks County, Pennsylvania, USA