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25.11 Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 28.16.
This heading covers only the naturally occurring barium sulphate (barytes sometimes known as heavy spar) and barium carbonate (witherite). Refined or chemically produced barium sulphate and barium carbonate are excluded (headings 28.33 and 28.36 respectively).
Calcined witherite, which consists largely of impure barium oxide, remains in this heading.
The heading excludes purified barium oxide (heading 28.16).
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