Slate - Metamorhic rock which is fine grained and can therefore be split into sheets.
Travertine - Starts as a calcareous dispersion deposited by hot mineral springs. This creates a honeycomb structure which shows as pits on the surface. These 'holes' are generally filled with a resin.
Sand Stone - Course grain compressed sediment rock. Very hard but porous requiring impregnation sealant.
Terracotta - Ceramic of rustic style made from natural clay. Very porous when untreated
Colbrook, Coat Road
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