Not surprisingly, it comes from Caithness which is covered in the stuff. It is cheap as chips in the area and has been used for anything from building house walls and slate roofs, to making field walls and road side kerbs.
Here are some photographs of the slabs in their natural state around the Dunnet Bay - Castleton Area. It is easy see why they are used and made, by splitting into thin sections then cutting to slab shapes.
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