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 04 Millstones, grindstones, grinding wheels and the like, without frameworks, for g 68 04 10 68 04 10 00 Commodity Code Description 68 04 10 00 00 - Millstones and grindstones for milling, grinding or pulping 68 04 21 00 00 -- Of agglomerated synthetic or natural diamond 68 04 22 00 00 -- Of other agglomerated abrasives or of ceramics 68 04 23 00 00 -- Of natural stone 68 04 30 00 00 - Hand sharpening or polishing stones