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HSChapter 25
U.S. imports of andalusite, kyanite, and sillimanite (including calcined) (HS 250850) totaled $137K in April 2026, traded with 4 countries.
Importers of Andalusite, Kyanite, and Sillimanite (Including Calcined) paid $12K in duties in April 2026 — an effective duty rate of 9.0% on $137K in dutiable value, based on actual customs collections rather than the published tariff schedule. Andalusite, Kyanite, and Sillimanite (Including Calcined) imports of $137K in April 2026 ran 13% above the year-to-date monthly average of $121K.
Last updated: April 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.
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.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| GERMANY | -- | $316K | +$316K |
| CHINA | -- | $285K | +$285K |
| JAPAN | -- | $155K | +$155K |
| CANADA | -- | $136K | +$136K |
| NETHERLANDS | -- | $123K | +$123K |
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2508500000 | ANDALUCITE, KYANITE AND SILLIMANITE | $137K | 9.02% | $12K |
ANDALUCITE, KYANITE AND SILLIMANITE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2508500000 | ANDALUCITE, KYANITE AND SILLIMANITE | $1.4M |
ANDALUCITE, KYANITE AND SILLIMANITE
2.6K t
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| State | Imports | Exports | Balance |
|---|---|---|---|
| Virginia | -- | $1.3M | +$1.3M |
| Ohio | $72K | $20K | -$51K |
| California | -- | $67K | +$67K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NORFOLK-NEWPORT NEWS, VA | $27K | $840K | +$814K |
| WILMINGTON, NC | -- | $315K | +$315K |
| BUFFALO-NIAGARA FALLS, NY | $22K | $102K | +$80K |