U.S. imports of andalusite, kyanite & sillimanite, whether or not calcined (HS 250850) totaled $137K in April 2026, traded with 4 countries.
Last updated: April 2026 dataAndalusite, kyanite, and sillimanite are polymorphic aluminosilicate minerals that convert to mullite at high temperatures, making them essential raw materials for high-performance refractories, technical ceramics, and spark plug insulators. All three minerals — whether raw or calcined — are classified under a single US tariff line (2508500000), simplifying entry but requiring careful documentation of mineral identity. Peru is the leading supplier to the US market, with France and South Africa also among the top sources.
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The three minerals are chemically identical (Al₂SiO₅) but differ in crystal structure. For trade classification purposes, the US schedule treats them as equivalent under 2508500000 because their end uses in refractories and ceramics are interchangeable, and distinguishing them at the border would add complexity without meaningful tariff differentiation.
Peru is the leading supplier, followed by France and South Africa. The United Kingdom also appears among notable source countries.
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Exports
$1.4M
Imports: $137K to 4 countries
Surplus of $1.3M (net exporter)
Trade balance: surplus of $1.3M (net exporter)
YTD: $484K imported (April 2026)
11 shipments/month
Monthly import values over time
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
NATURAL BARIUM SULFATE (BARYTES)
HS 251110
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
Top U.S. entry points for this product, ranked by latest-month import value.