Composed of metamorphosed limestone. Marble surface crumbles readily when exposed to a moist, acid atmosphere, but marble is durable in a dry atmosphere and when protected from rain. Statuary, the purest form of marble, is white with visible crystalline structure. Marble was used by ancient Greek sculptors and architects. Romans used it architectural purposes in the time of Augustus. The greatest works of Michelangelo are made of Carrera marble, which is still used extensively by sculptors.
Marble, is recommended for interior projects, because it is not as resistant to weathering as granite is.