QUARTZ (OTHER THAN NATURAL SANDS); QUARTZITE, WHETHER OR NOT ROUGHLY TRIMMED OR MERELY CUT, BY SAWING OR OTHERWISE, INTO BLOCKS OR SLABS OF A RECTANGULAR (INCLUDING SQUARE) SHAPE
OTHER CLAYS (NOT INCLUDING EXPANDED CLAYS OF HEADING 68.06), ANDALUSITE, KYANITE AND SILLIMANITE, WHETHER OR NOT CALCINED; MULLITE; CHAMOTTE OR DINAS EARTHS (+)
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