There's a lot of slate in Pembrokeshire I seem to remember. Varying from very hard and sharp - but always splittable - to completely rotten stuff you can crumble in your hand, and the strata also varying from horizontal to vertical.
Decent slate rooftiles are well worth a close look, chipped away beautifully round the edges on both sides. No wonder terracotta tiles are cheaper, lump of clay shaped over a fat girl's thigh and chucked in an oven...
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