… Other clays (not including expanded clays of heading 68.06), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths. …
Explanatory notes
… 25.08 ‑ O ther clays (not including expanded clays of heading 68.06), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas … 2508.10 ‑ Bentonite 2508.30 ‑ Fire‑clay 2508.40 ‑ Other clays 2508.50 ‑ Andalusite, kyanite and sillimanite …