N4
| Reference | N4 |
| NAME | Berwyn (honed) |
| TYPE | Slate |
| GEOLOGY | Silurian. Ludlow Beds |
| COUNTY | Clywd |
| COLOUR | Deep blue |
| TEXTURE | Extremely fine grained. Finely cleaved |
| BLOCK SIZE LXBXH (mm) | 2500x1500x75mm |
| SUITABILITY | Roofing, cladding, paving, cills, copings and fireplaces |
| USES (1) | |
| USES (2) | |
| USES (3) | |
| USES (4) | |
| Stone Names |