Section 13 Articles of stone, plaster,cement,asbestos, mica or similar materials; ceramic products; glass and glassware 68 Articles of stone, plaster, cement, asbestos, mica or similar materials 68 04 Millstones, grindstones... of natural stone..., for grinding, etc 68 04 22 Millstones, etc, of other agglomerated abrasives or of ceramics Commodity Code Description 68 04 22 00 Millstones, etc, of other agglomerated abrasives or of ceramics