The principal zirconium ores generally classified in this heading are :(a) Baddeleyite, zirconium oxide. (b) Zircon and zircon sands, zirconium silicates. (When in the form of a precious stone, zircon falls in heading 71.03.)
The principal tantalum and niobium (columbium) ores generally classified in this heading are tantalite and niobite (columbite) (i.e., tantalo-niobate of iron and manganese).
The principal vanadium ores generally classified in this heading are : (a) Descloizite, basic vanadate of lead and zinc. (b) Patronite, vanadium sulphide. (c) Roscoelite (vanadium mica), complex vanado-silicate of aluminium and magnesium. (d) Vanadinite, vanadate and chloride of lead.
Fused vanadium oxides obtained by treatments, other than calcining or roasting, which alter the chemical composition or crystallographic structure of the basic ore are excluded (generally Chapter 28).
The heading also excludes zircon sand micronised for use as an opacifier in enamel manufacture (heading 25.30).
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