Marble is a metamorphic rock composed of recrystallized carbonate minerals (most commonly calcite or dolomite). Carrara marble is a translucent white marble of exceptional quality, quarried from the Apuan Alps above Carrara at the very northwestern corner of Tuscany. Carrara marble – especially the purest white yield known as Statuario - has been prized since ancient times. In addition to Michelangelo’s Pieta and David sculptures, Carrara marble was used for The Pantheon, Trajan’s Column and the Column of Marcus Aurelius in Rome. The Carrara quarries have produced more marble than any other place on earth, but by the end of the 20th century, all known deposits of Statuario marble have been fully exhausted.