U.S. imports of Andalusite, Kyanite, and Sillimanite (Including Calcined) (HS 250850) totaled $124K in September 2026, imported from 4 countries.
Importers of Andalusite, Kyanite, and Sillimanite (Including Calcined) paid $12K in duties in September 2026, an average duty rate of 9.74% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Andalusite, Kyanite, and Sillimanite (Including Calcined) imports of $124K in September 2026 ran 34% below the year-to-date monthly average of $187K.
Last updated: September 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.
9 import shipments a month
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.
ImportsExports
Imports
$124KYoY · free account
Exports
—YoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $1.9M of Andalusite, Kyanite, and Sillimanite (Including Calcined).
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through September 2026 · exports 11 of 12 months reported. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 250850 — Andalusite, Kyanite, and Sillimanite (Including Calcined), so the companies trading it can find you. Be the first supplier listed.
Subheading 5 of 6 in heading 2508
Subheading 250850 · $124K of $2.8M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2508500000 | Andalucite, Kyanite and Sillimanite | $106K | 11.87% | 100.00% | $13K |
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 | $1.8M |
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.
Imports · September 2026
origin
Peru and France together supply 74% of it. Peru pays 12.5% duty; United Kingdom 0.0%.
customs district
destination
entry
rate provision · imports
duty collected equals 9.74% of imports for consumption.