14591 - Bentonite
14592 - Fire clay
1459211 - - Crude fire clay
1459221 - - Prepared fire clay
14593 - Fuller's Earth
14596 - Feldspar (Crude, Crushed, or Ground)
14597 - Common (Miscellaneous) clay & Shale
1459711 - - Crude common (Miscellaneous) clay & Shale
1459721 - - Prepared common (Miscellaneous) clay & Shale
14599 - Other Clay, Ceramic & Refractory minerals incl Magnesite & Brucite