Section 13 Articles of stone, plaster,cement,asbestos, mica or similar materials; ceramic products; glass and glassware 69 Ceramic products 69 02 Refractory bricks,...,& similar construction goods (excl.siliceous fossil meal orearth) 69 02 10 Containing by weight,singly or together,more than 50% of the elements Mg,Ca or Cr,...... Commodity Code Description 69 02 10 00 Containing by weight,singly or together,more than 50% of the elements Mg,Ca or Cr,......