Abstract
Fluorine micas were synthesized using talc and K 2 SiF 6 at 900°C for 1 hour in an electric furnace. With increasing K 2 SiF 6 /talc ratio, b and c unit cell parameters of synthetic fluorine micas were decreased. This result may be interpreted in terms of the shrinkage of the octahedral sheet by the loss of Mg 2+ from the octahedral site. Infrared absorption spectra of synthetic micas showed the splitting of the absorption band of Si-O stretching, which indicates that some alkali ions migrate into the interlayer site of silicate skeleton. The one dimensional Fourier synthesis showed that with the increase of K 2 SiF 6 /talc ratio the electron density of K + in the interlayer site of synthetic micas increased and that of Mg 2+ from the octahedral site decreased
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