Explanatory notes
… Crude mica , which consists of mica crystals, of irregular shape, size and thickness, covered with earth (“books”). … (built‑up) splittings (e.g., micanite, micafolium) or from pulped (reconstituted) mica ( heading 68.14 ). Vermiculite, … a mineral allied to mica, falls in heading 25.30 , as do perlite and the chlorites (minerals chemically related to …