Harmonized System
Section V > Chapter 25 > Heading 2508 > 2508.70
Chamotte or dinas earths
Section V > Chapter 25 > Heading 2510
Natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk.
Section V > Chapter 25 > Heading 2511
Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 28.16.
Section V > Chapter 25 > Heading 2511 > 2511.10
Natural barium sulphate (barytes)
Section V > Chapter 25 > Heading 2511 > 2511.20
Natural barium carbonate (witherite)