WORKED MONUMENTAL OR BUILDING STONE (EXCEPT SLATE) AND ARTICLES THEREOF, OTHER THAN GOODS OF HEADING 6801; MOSAIC CUBES AND THE LIKE, OF NATURAL STONE (INCLUDING SLATE), WHETHER OR NOT ON A BACKING; ARTIFICIALLY COLOURED GRANULES, CHIPPINGS AND POWDER, OF NATURAL STONE (INCLUDING SLATE) - OTHER MONUMENTAL OR BUILDING STONE AND ARTICLES THEREOF, SIMPLY CUT OR SAWN, WITH A FLAT OR EVEN SURFACE : OTHER CALCAREOUS STONE