The principal ores generally classified in this heading are:
(a) Red haematite, including specular iron ore and martite ‑ iron oxides ‑ and brown haematite (minettes) ‑ hydrated iron oxide containing iron and calcium carbonates. (b) Limonite, hydrated iron oxide. (c) Magnetite, magnetic iron oxide. (d) Siderite or chalybite, iron carbonate. (e) Roasted iron pyrites or pyrites cinders, whether or not agglomerated. The heading also covers iron ores and concentrates with a manganese content of less than 20 % calculated on the dry weight (the ores and concentrates being heated to a temperature of 105 to 110 ¡ÆC) (see Explanatory Note to heading 26.02). Depending upon their manganese content, these ores are known either as manganiferous iron ores or as ferruginous manganese ores. The heading excludes finely ground magnetite and other finely ground iron ores for use as pigments (Chapter 32).
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