The customs code decides what your mineral is

A shipment crosses a border as a code, not as a mineral — and the chapter it enters under decides its duty, its visibility in trade data, and whether a measure reaches it at all.

Pending review

A sealed woven bulk bag standing filled and closed on a pallet in a warehouse aisle, two identical bags on pallets receding behind it. — Illustrative artwork: sealed bulk cargo of the kind classified under customs tariff systems. Not a facility, equipment or material connected to this project. · Illustration · Osmond Hub

The short version

A mineral does not cross a border as a mineral. It crosses as a line in the Harmonized System, and that line decides the duty it attracts, the statistical series it appears in, and whether a trade measure written for one form of a material reaches another form of the same material. For this mineral set the same atoms are scattered across at least four chapters of the nomenclature, and monazite is not named in the international text at all.

Chapter 26 sorts rock by what someone means to get out of it

The nomenclature's ore chapter is organised around intent, and it says so. Its own note defines the term: for the purposes of headings 26.01 to 26.17, "ores" means "minerals of mineralogical species actually used in the metallurgical industry for the extraction of mercury, of the metals of heading 28.44 or of the metals of Section XIV or XV, even if they are intended for non-metallurgical purposes"(opens in a new tab). The same note then draws the boundary at the far end: those headings do not "include minerals which have been submitted to processes not normal to the metallurgical industry"(opens in a new tab).

So a rock's classification is not a mineralogical fact. It is a fact about what the metallurgical industry does with that species, and about how far the material has already been taken.

Within that logic the headings for this group read straightforwardly. 26.14 is "Titanium ores and concentrates"(opens in a new tab). 26.15 is "Niobium, tantalum, vanadium or zirconium ores and concentrates", with 2615.10 "Zirconium ores and concentrates"(opens in a new tab) — zircon sharing a heading with three unrelated metals. And 26.12 is "Uranium or thorium ores and concentrates", with 2612.20 "Thorium ores and concentrates"(opens in a new tab).

The same atom, four chapters along

Follow one element through processing and it changes chapter repeatedly, and the duty changes with it.

Titanium starts in 26.14. The US tariff schedule splits that heading into synthetic rutile at 2614.00.3000, ilmenite and ilmenite sand at 2614.00.6020 and rutile concentrate at 2614.00.6040(opens in a new tab) — but titanium slag, which is a processed intermediate, leaves the ore chapter entirely and is classified at 2620.99.5000(opens in a new tab), among ash and residues. Take it further and it becomes titanium oxides under heading 28.23(opens in a new tab), then metal in Chapter 81.

Zirconium takes a stranger route, and the tariff consequences are visible in one column. From 2615.10 it becomes an oxide under a subheading it shares with a completely different element: 2825.60 is "Germanium oxides and zirconium dioxide"(opens in a new tab). The US schedule then reads, for a single element: zirconium ores and concentrates at 2615.10.0000, "Free."; zirconium compounds at 2825.60.0020 and 2836.99.5010, "3.7% ad valorem"; ferrozirconium at 7202.99.1000, "4.2% ad valorem."; zirconium unwrought and powder at 8109.21.0000 and 8109.29.0000, "4.2% ad valorem."; zirconium waste and scrap at 8109.31.0000 and 8109.39.0000, "Free."; and other zirconium articles at 8109.91.0000 and 8109.99.0000, "3.7% ad valorem."(opens in a new tab)

Hafnium, which is separated from zirconium and travels with it through the whole upstream chain, sits in a different heading altogether — and there too the form decides the rate: hafnium unwrought including powders at 8112.31.0000, "Free.", and "Hafnium, other" at 8112.39.0000, "4% ad valorem."(opens in a new tab)

The rare earths show the historical layering most clearly. 2805.30 covers "Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed"(opens in a new tab); 28.46 covers their compounds, and subdivides into 2846.10 "Cerium compounds" and 2846.90 "Other"(opens in a new tab). Cerium gets a line of its own; every other rare-earth compound falls into "Other".

Nothing in a customs schedule is neutral. Every heading is a decision, taken by somebody, about which property of a material was the interesting one.

Monazite is the clearest case, and it is not in the text

Monazite is, as a general matter of mineralogy rather than any figure taken from a source here, a rare-earth phosphate that also carries thorium. Where does it enter?

Not by name in the international nomenclature: the word does not appear anywhere in Chapter 26(opens in a new tab), at any level.

Where it is named is one step down, in a member's own subdivision — and that subdivision sits under thorium ores and concentrates rather than under anything to do with rare earths. The eight-digit line displayed in the WTO's import licensing database, under North Macedonia's coverage of product category 645 ("Uranium and radioactive elements"), reads: 261220 1000 — "Monazite; urano-thorianite and other thorium ores and concentrates, with a thorium content of more than 20 % by weight (Euratom)"(opens in a new tab), with 261220 9000 as "Other"(opens in a new tab). The line names monazite first and attaches a thorium threshold; exactly how that threshold applies across the items in the list is a question for the classifying authority, and this article does not answer it. Nor does it claim anything about the WCO's Explanatory Notes, which are not freely published and were not read.

The code is also the data

The last consequence is the quietest. Because trade statistics are compiled from these headings, anything the headings do not separate is invisible.

USGS's zirconium chapter carries a footnote to its export figures reading simply that they exclude "zircon in mixed mineral concentrates"(opens in a new tab) — material that physically left the country but does not appear in the zircon series, because it moved under a different description. In the same chapter, world primary hafnium production data and quantitative estimates of hafnium reserves "were not available"(opens in a new tab).

None of this is a failure of the system; a nomenclature that separated every mineral by every interesting property would be unusable. But it means that a chart of trade in a minor mineral is, first, a chart of what that mineral's headings happen to capture — and the gap between the two is not visible on the chart.

Related

Commodity Prices — the specifications that sit alongside these classifications in a contract
Export Routes — the physical corridors behind the recorded flows
Export Controls — measures that attach to some descriptions and not others
Processing Capacity — why the chapter changes so often along one chain
Supply Chain Risk — what an invisible flow does to an exposure assessment

Sources

PRIMARYWorld Customs Organization, Harmonized System Nomenclature, Chapter 26 (Ores, slag and ash), 2002 edition — the text freely published by the WCO. Chapter Note 2 defining 'ores'; headings 26.12 (uranium or thorium ores and concentrates, with subheading 2612.20 thorium ores and concentrates), 26.14 (titanium ores and concentrates) and 26.15 (niobium, tantalum, vanadium or zirconium ores and concentrates, with subheading 2615.10 zirconium ores and concentrates). Confirmed by direct reading that the word 'monazite' does not appear anywhere in this chapter.(opens in a new tab)
PRIMARYWorld Customs Organization, Harmonized System Nomenclature, Chapter 28, 2002 edition. Subheading 2805.30 (rare-earth metals, scandium and yttrium); heading 28.23 (titanium oxides); subheading 2825.60 ('Germanium oxides and zirconium dioxide'); heading 28.46 (compounds of rare-earth metals, of yttrium or of scandium) with subheadings 2846.10 (cerium compounds) and 2846.90 (other).(opens in a new tab)
PRIMARYWTO Import Licensing Notification Portal, product-category coverage page for category 645 ('Uranium and radioactive elements'), displaying North Macedonia's coverage; the page does not name the European Union or the Combined Nomenclature, though '(Euratom)' appears in several of the descriptions. Code 261220 1000: 'Monazite; urano-thorianite and other thorium ores and concentrates, with a thorium content of more than 20 % by weight (Euratom)'; code 261220 9000: 'Other'. An intergovernmental database reproducing a member's own notified nomenclature, not the EU legal text itself.(opens in a new tab)
PRIMARYU.S. Geological Survey, Mineral Commodity Summaries 2026 — Zirconium and Hafnium. Tariff section lines, including 'Hafnium, unwrought, including powders 8112.31.0000 Free.' and 'Hafnium, other 8112.39.0000 4% ad valorem.'; the export-data footnote 'Excludes zircon in mixed mineral concentrates'; and 'World primary hafnium production data and quantitative estimates of hafnium reserves were not available.'(opens in a new tab)
PRIMARYU.S. Geological Survey, Mineral Commodity Summaries 2026 — Titanium Mineral Concentrates. Tariff section lines for synthetic rutile (2614.00.3000), ilmenite and ilmenite sand (2614.00.6020), rutile concentrate (2614.00.6040) and titanium slag (2620.99.5000).(opens in a new tab)
ANALYSISANALYSIS — the reading that the nomenclature sorts these minerals by the element someone intended to extract, and that this is why one substance appears across several chapters, is this publication's framing. Note what is NOT claimed: the WCO Explanatory Notes are not freely published and were not read, so nothing is asserted about how they treat monazite; and no claim is made about where monazite below the European threshold is classified.Non-public document · no public URL