… Niobium, tantalum, vanadium or zirconium ores and concentrates. …
Explanatory notes
… 26.15 ‑ N iobium, tantalum, vanadium or zirconium ores and concentrates. 2615.10 ‑ Zirconium ores and … zirconium oxide. (b) Zircon and zircon sands, zirconium silicates. (When in the form of a precious stone, zircon … and niobite (columbite) (i.e., tantalo‑niobate of iron and manganese). The principal vanadium ores generally classified …