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HSChapter 25
U.S. exports of andalusite, kyanite, and sillimanite (including calcined) (HS 250850) totaled $1.5M in July 2026.
Importers of Andalusite, Kyanite, and Sillimanite (Including Calcined) paid $10K in duties in July 2026 — an effective duty rate of 8.7% on $120K in dutiable value, based on actual customs collections rather than the published tariff schedule. Andalusite, Kyanite, and Sillimanite (Including Calcined) imports of $120K in July 2026 ran 42% below the year-to-date monthly average of $208K.
Last updated: July 2026 dataAndalusite, kyanite, and sillimanite are aluminum silicate polymorphs — chemically identical but structurally distinct — that convert to mullite when fired, making them essential raw materials for high-performance refractories in steel, glass, and ceramics manufacturing. Peru leads US import supply, followed by France and South Africa, with South Africa's Andalusite Resources being one of the world's largest single-source producers. All three minerals, whether raw or calcined, are classified under a single 10-digit line (2508500000), and the specific polymorph and calcination state should be declared on commercial invoices to support end-use verification.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
6 shipments/mo
All three are aluminum silicate polymorphs (Al₂SiO₅) sharing the same chemical formula and the same end-use profile as refractory and ceramic raw materials. The HS system classifies them together because their commercial function and trade characteristics are essentially interchangeable for tariff purposes, even though refractory manufacturers select among them based on firing temperature, conversion kinetics, and volume stability.
Key specifications include Al₂O₃ content (typically 55–60% for kyanite and sillimanite, up to 58% for andalusite), Fe₂O₃ and TiO₂ impurity limits, particle size distribution, and — for calcined grades — mullite conversion percentage. Suppliers generally provide X-ray diffraction analysis and chemical assay certificates; these documents also support correct HTS classification and can be requested by CBP during a classification review.
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Subheading 5 of 6 in heading 2508
Subheading 250850 · $120K of $3.1M
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 | Duty Collected |
|---|---|---|---|---|---|
| 2508500000 | Andalucite, Kyanite and Sillimanite | $120K | 8.66% | 100.00% | $10K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2508500000 | Andalucite, Kyanite and Sillimanite | $1.5M |
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.
ImportsExports
Imports
$120KYoY · Pro
Exports
$1.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
the effective duty rate is 8.66%.