Heading 2515

Marble, travertine, ecaussine and other calcareous stone; of an apparent specific gravity of less than 2.5, alabaster, whether cut by sawing etc, into blocks, slabs of a rectangular (square) shape

251511 Marble and travertine; having a specific gravity of 2.5 or more, crude or roughly trimmed by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape 251512 Marble and travertine; merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape, having a specific gravity of 2.5 or more 251520 Ecaussine and other calcareous monumental or building stone; alabaster, having a specific gravity of 2.5 or more