Abstract
A swelling Na-4-mica of the brittle mica type (ideal chemical composition of Na4Mg6Al4Si4O20F4·xH2O) was prepared by a simplified one-step synthetic process from kaolinite at or below 800 °C. Hydrated and well-dispersed Na-4-mica particles of about 2 µm in size were prepared at 800 °C. The