Merely cut, by sawing or otherwise, into blocks or slabs of

25.15 - 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, b sawing or otherwise, into blocks or slabs of a rectangular (including square) shape 6). - Marble and travertine : 2515.11 - - Crude or roughly trimmed 2515.12 - - Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape 2515.20 - Ecaussine and other calcareous monumental or building stone; alabaster Marble is a hard calcareous stone, homogeneous and fine- ained, often crystalline and either opaque or translucent. Marble is usually variously tinted y the presence of mineral oxides (coloured veined marble, onyx marble, etc.), but there are pure white varieties. f Travertines are varieties of calcareous stone containing layers of open cells. Ecaussine is extracted from various quarries in Belgium and particularly at Ecaussines. It is a bluish-grey stone with an irregular crystalline structure and contains man fossilised shells. On fracture Ecaussine shows a granular surface similar to granite and is there ore sometimes known as " Belgian granite "," Flanders granite " or "petit granit ". r The heading covers other similar hard calcareous monumental or building stones, rovided their apparent specific gravi is 2.5 or more (i.e., effective weight in kgll, 00 cm3). Calcareous monumental or buil ng stones of an apparent specific gravlty of less than 2.5 are classified in heading 25.16. The heading also includes both gypseous alabaster, which is usually white and uniformly translucent, and calcareous alabaster, normally yellowish and veined. The heading is restricted to the stones specified, presented in the mass or roughly w e d or merely cut, b sawing or otherwise, into blocks or slabs of a rectangular (including square) shape. In the o m of granules, chippings or powder, they fall in heading 25.17. B Blocks, etc., which have been fiuther worked, i.e., bossed, dressed yith %e pick, bushin hammer or chisel, etc., sand-dressed, ground, polished, chamfered, etc., are classified in heading 68. 2. The same classification applies to blanks of articles. The heading also excludes : (a) Serpentine or ophite (a magnesium silicate sometimes called marble) (heading 25.16). (b) Limestone (known as " lithographic stone " and used in the printing industry) (heading 25.30 when in the crude state). (c) Stones identifiable as mosaic cubes or as paving flagstones, even if merely shaped or processed as specified in the text of this heading (heading 68.02 or 68.01 respectively).