Sub Headings of 2508

2508.10.00.00 Bentonite
2508.30.00.00 Fire-clay
2508.40.01. Other clays
2508.50.00.00 Andalusite, kyanite and sillimanite
2508.60.00.00 Mullite
2508.70.00.00 Chamotte or dinas earth