Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths:

6902.10Containing by weight, singly or together, more than 50 percent of the elements magnesium, calcium or chromium, expressed as MgO, CaO or Cr2O3: 6902.10.10.00Magnesite bricks 6902.10.50.00Other 6902.20Containing by weight more than 50 percent of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products: 6902.20.10Bricks 6902.20.10.10Alumina 6902.20.10.20Other 6902.20.50Other 6902.20.50.10Alumina 6902.20.50.20Other 6902.90Other: 6902.90.10Bricks 6902.90.10.10Clay 6902.90.10.20Other 6902.90.50Other 6902.90.50.10Clay 6902.90.50.20Other