Marble
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Marble is similar to travertine, but is a metamorphic rather than a sedimentary rock. This means that it has been compressed, heated and cooled during its time in the ground, so that it is actually a mass of little crystals. It is harder, denser and less porous than travertine, and has a different colour palette. Marble tiles give a very classical appearance, with a natural variation in the colour inclusions.