Abstract
Partial chemical analyses of eighteen biotite samples along with complete analyses of the respective host rocks were carried out on some metamorphic and granitic rocks of the area around Richughuta in the Palamau district of Bihar. Chemical changes in the biotites show an increase of Ti, Fe, Mn and alkali contents with decrease of Al, Mg and MgO/FeO ratio from schist to granite. The ratio MgO/FeO increases with increase in the oxidation ratio of the host rock.
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