Explanatory notes
… fossil meals or similar siliceous earths (+). 6902.10 - Containing by weight, singly or together, more than 50 % of … elements Mg, Ca or Cr, or expressed as MgO, CaO or Cr 2 O 3 6902.20 - Containing by weight more than 50 % of alumina (Al 2 O 3 ), …