BGS mineralogy and petrology collection record
| Sample number | E61617; COLLNOMH1531; |
|---|---|
| Sample Donor | Howells,M.F. |
| Rock name | Not entered |
| Stratigraphy | Not entered |
| Comments | Acid tuff/tuffite--Thin section: highly silicified v. fine-grained rock, equigranular with intergranular phyllosilicate. Probably silicified volcanic rock -- not possible to tell precursor lithology |
| Locality details | NW of Llynnau Cregennan |
| 50k map sheet | Barmouth (149) |
| Map reference | SN 6528 1147 |
| 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
E61617
