BGS mineralogy and petrology collection record
| Sample number | MR6581 |
|---|---|
| Sample Donor | Not entered |
| Rock name | 'Original entry: Porphyrite, Altered Andesite.' |
| Stratigraphy | Not entered |
| Comments | 189/4, Q/168 |
| Locality details | Gaer-fawr, Carneddau, nr. Builth, Breconshire |
| 50k map sheet | Builth (196) |
| Map reference | SO 058 531 |
| Year collected | Not entered |
| Bore name | Not applicable |
| Confidentiality | No restrictions |