Explanatory notes
… extractable ( Chapter 26 ), this heading covers all natural sea, lake, river or quarry sand (i.e., sand in the form of … covers, inter alia : (1) Silica sands and quartz sands, used in building, in the glass industry, for cleaning … sands (monazites) which are classified as thorium ores; all these fall in Chapter 26 . Nor does the heading cover tar …