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HSChapter 25
U.S. imports of natural magnesium carbonate (magnesite) (HS 251910) totaled $370K in April 2026, traded with 8 countries.
Last updated: April 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.
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.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CHINA | $254K | -- | -$254K |
| JAPAN | $61K | $3K | -$58K |
| UNITED KINGDOM | -- | $46K | +$46K |
| CANADA | $11K | $29K | +$19K |
| TAIWAN | $38K | -- | -$38K |
Monthly import values over time
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