Explanatory notes
… sea, lake, river or quarry sand (i.e., sand in the form of more or less fine particles resulting from the natural … including kaolinic sands, used mainly for preparing foundry moulds and refractory products. (3) Feldspathic sands, … sands, zircon sands, rutile sands and ilmenite sands, nor monazite sands (monazites) which are classified as thorium …