Marble is a granular metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Recrystallisation is caused by metamorphism (heat and pressure) of these minerals. This also results in the different type of veining and colours seen in marble along with the different textures (fine to coarse). Due to the high content of calcium carbonate, marble is susceptible to etching from acid based contaminants eg wine, citrus, soft drinks. A tumbled finish is a flat, matt antique/old world look with irregular edges achieved during the tumbling/ageing process.