Perhaps I should have been a bit clearer in my description. I have always thought of them as shiny as a way of differentiating them from the more common brick - actually i have used a variety of descriptors for them depending on the amount of dripping that occurs

You are right in that they are not shiny per se, rather, as you say, they are more dense and waterproof. Certainly though, up north (Manchester way) they have a semi-lustrous sheen to their exterior. I would be very interested in seeing your photographs though.
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