Greywache
data tableGreywache
data table
| Family: |
Sedimentary |
| Formation: | Formed of sandstone, but mixed with lots of clay and other rock particles. |
| Texture: | Varied - some is clearly made of sand (medium grained). Others are more muddy (fine grained). |
| Colour: | Grey; green; blue. |
| Location: | Much of County Down. |
| Uses: | Used as a roadstone. |
| Chemistry: | None. |
| Notes: | The odd name 'greywacke' means 'grey grit' which is a good description for rock made of sand grains surrounded by clay particles. |