2515 MARBLE, TRAVERTINE, ECAUSSINE 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 2515 10 00-MARBLE AND TRAVERTINE: 2517 41 00--OF MARBLE 6802 21 10---MARBLE BLOCKS OR TILES 6802 21 20---MARBLEMONUMENTA