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The principal ores generally covered by this heading are :
(a) Braunite, manganese oxide. (b) Rhodochrosite (or dialogite), manganese carbonate. (c) Hausmannite, saline manganese oxide. (d) Manganite, hydrated manganese oxide. (e) Psilomelane, hydrated manganese dioxide. (f) Pyrolusite (or polianite), manganese dioxide. The heading also covers ferruginous manganese ores and concentrates, provided they have a manganese content of 20 % or more, calculated on the dry weight (the ores and concentrates being heated to a temperature of 105 to 110 °C); those with a manganese content of less than 20 % calculated on the dry weight are excluded (heading 26.01).
The heading also excludes pyrolusite prepared for use in dry batteries (heading 25.30).
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