Biotite from Chester County, Pennsylvania, USA
USA | |
| Mineral Collecting in PA (1976) Geyer, Smith, Barnes, pgs. 73-75 |
| Mineralogical Record, 25(2),pp:105-120. |
| Min. Col. in PA (1976) Geyer, Smith, Barnes, pgs. 85-86 |
USA | |
| Mineral Collecting in PA (1976) Geyer, Smith, Barnes, pgs. 73-75 |
| Mineralogical Record, 25(2),pp:105-120. |
| Min. Col. in PA (1976) Geyer, Smith, Barnes, pgs. 85-86 |