Abstract
Abstract Fluor-hydroxyl muscovite was synthesized from a mixture of gels and chemicals of the KAl3Si3O10Fx(OH)2−x composition, where x=0, 0.5, 1.0, 1.5 and 2.0, in the temperature range of 500–600°C under pressures ranging from 500 to 900 atm. The fluorine content of the synthetic muscovite increased with the increase in x, but the distribution coefficient of fluorine [(the fluorine content of the crystal)/(the fluorine concentration of the solution)] decreased with the increase in x, increased with the increase in the temperature of synthesis, and decreased with the increase in the pressure of synthesis. The synthetic fluor-hydroxyl muscovite crystallized mainly in 1M polymorph, and very little in 2M polymorph, at 500°C in 20 hr. The fraction of 2M muscovite increased with the increasing temperature of synthesis. The d005 and d060d lattice spacings of the mica were observed to decrease linearly with the increase in the fluorine content of the mica.
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