Explanatory notes
… heading includes : (A) Crude mica , which consists of mica crystals, of irregular shape, size and thickness, covered … manufacture of built‑up mica (e.g., micanite). The heading also includes mica waste and powder. The heading excludes … ( heading 68.14 ). Vermiculite, a mineral allied to mica, falls in heading 25.30 , as do perlite and the chlorites …