… Niobium, tantalum, vanadium or zirconium ores and …
Explanatory notes
… 26.15 ‑ N iobium, tantalum, vanadium or zirconium ores 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 …