Abstract
Phlogopite samples from different regions were studied by a Mossbauer spectroscopic technique after heat treating them in air at different temperatures. All the samples show a loss of micaceous tetrahedral-octahedral-tetrahedral structure above 1000 degrees C. The oxidation and dehydroxylation processes occurring prior to decomposition were explained with the help of Vedder and Wilkin's propositions. The relaxation patterns observed were the consequence of the superparamagnetic phenomenon due to the presence of fine particles. An attempt was made to calculate particle sizes with the help of Mossbauer parameters.
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