Marble is formed through a process of metamorphic sedimentary rocks such as limestone or dolomite, which causes a complete recrystallization of calcium carbonate of which are predominantly composed and gives rise to a mosaic of crystals of calcite or dolomite (mineral) . L 'combined action of temperature and pressure during processing of the sedimentary rock of marble, leads to progressive obliteration of the original structures and textures in the rock, resulting in the destruction of any fossil stratification or other structure in sedimentary rock original. The color of marble depends on the presence of impurity minerals (clay, silt, sand, iron oxides, nodules of flint), existing granules or layers within the original sedimentary rock. During the metamorphic process these impurities are moved and recrystallised because of pressure and heat. The white marble is the result of limestone metamorfizzazione free of impurities.