2515.12.20

Marble, travertine and other calcareous monumental or building stone of an apparent specific gravity of 2.5 or more, and alabaster, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape: Marble and travertine: Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape: Travertine