Section 13 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIAL S; CERAMIC PRODUCTS; GLASS AND GLASSWARE 68 Articles of stone, plaster, cement, asbestos, mica or similar materials 68 15 Articles of stone or of other mineral substances (including carbon fibres, artic 68 15 91 Commodity Code Description 68 15 91 00 68 15 91 10 Refractory bricks, blocks, tiles and similar refractory constructional goods includin 68 15 91 90 Other