Explanatory notes
… ‑ ‑ Other (A) BERYLLIUM Beryllium is obtained almost exclusively from beryl, a double silicate of beryllium and aluminium, which is classified under heading 26.17 except when it is in the form of a precious stone (e.g., … machinery parts, parts of instruments, etc., are, however, excluded (see particularly Chapters 85 and 90 ). (B) …