Marble is a metamorphic rock which is formed when limestone re-crystallizes. This process is caused by heat and pressure which interlocks the stone particles to become a mosaic of crystals. The different arrays of colors which are found in marble are created by the various mineral impurities found within it which include clay, silt and sand. Its specific colors and textural variations make marble a highly decorative and exceptionally beautiful stone ideally used in bathrooms. In properly polished and sealed marble can be.