BGS mineralogy and petrology collection record
| Sample number | E27180; COLLNO5; |
|---|---|
| Sample Donor | Thomas,H.H. |
| Rock name | 'Original entry: Mineral Sample' |
| Stratigraphy | Not entered |
| Comments | Top of Tunnel. Ophitic Biotite |
| Locality details | Tan-y-Grisiau (Qry), Ffestiniog |
| 50k map sheet | Snowdon (119) |
| Map reference | SH 677 455 |
| Year collected | Not entered |
| Bore name | Not applicable |
| Confidentiality | No restrictions |
Petrological thin sections
Links to high resolution images
Transition from XPL to PPL light
E27180
