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HSChapter 25
U.S. exports of natural magnesium carbonate (magnesite) (HS 251910) totaled $217K in July 2026.
Natural Magnesium Carbonate (Magnesite) imports of $134K in July 2026 ran 55% below the year-to-date monthly average of $296K.
Last updated: July 2026 dataMagnesite — the naturally occurring mineral form of magnesium carbonate — is the primary raw material feedstock for the magnesium oxide and refractory industries, entering the US under tariff line 2519100000. China is by far the dominant global producer and the leading US supplier, a concentration that creates meaningful supply-chain risk for downstream refractory and chemical manufacturers. Japan, Brazil, and India are secondary sources. The mineral's MgO content and impurity profile (silica, iron, calcium) are the critical grade specifications that determine suitability for chemical-grade versus refractory-grade processing.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
13 shipments/mo
China controls a large share of global magnesite reserves and processing capacity, meaning US buyers of natural magnesium carbonate are heavily exposed to Chinese export policy, environmental production restrictions, and any trade-remedy measures that may apply. Importers sourcing from China should monitor Section 301 tariff applicability and consider qualifying alternative suppliers in Brazil or India as contingency sources.
Natural magnesite is the unprocessed or simply crushed/ground mineral as it occurs in nature. Once it is calcined or sintered to produce magnesium oxide (magnesia), it moves to heading 2519 subheadings covering fused magnesia, dead-burned magnesia, or caustic-calcined magnesite. The presence or absence of thermal processing is the definitive classification boundary.
ImportsExports
Imports
$134KYoY · Pro
Exports
$217KYoY · Pro
12-mo low · imports
YoY · ProFewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Panama and Canada together take 82% of it.
customs district
origin
entry
rate provision · imports
100.0% enters free of duty; the effective duty rate is 0.00%.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share |
|---|---|---|---|---|
| 2519100000 | Natural Magnesium Carbonate (magnesite) | $412K | 0.00% | 0.00% |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2519100000 | Natural Magnesium Carbonate (magnesite) | $224K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Subheading 2 of 2 in heading 2519
Subheading 251910 · $134K of $31.1M
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