Natural block mica is split from mined crystals into thin sheets and used where the highest dielectric purity is required, such as in precision capacitors. Agglomerated (reconstituted) mica is manufactured by bonding mica splittings or paper with a binder, producing a uniform sheet product suitable for large-scale electrical insulation applications. Both forms fall within 66335, but they differ significantly in price, availability, and performance specifications.

Yes. Mica mining in certain producing regions has been associated with child labor and informal mining practices, prompting electronics and automotive manufacturers to implement supply-chain traceability programs. Importers sourcing raw or worked mica should be prepared to provide origin documentation and supplier audit records to satisfy corporate social responsibility requirements and customer due-diligence requests.