… Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide …
Explanatory notes
… barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide … sulphate (barytes) 2511.20 ‑ Natural barium carbonate (witherite) This heading covers only the naturally occurring … ‑ sometimes known as heavy spar) and barium carbonate (witherite). Refined or chemically produced barium sulphate …