Fassaite from a calc-silicate vein occurring in the limestones of the khondalite group of Eastern Ghats near Gondivalasa is described. The high proportion of CaAl2SiO6 pyroxene component in fassaite indicates that the amount of CaAl2SiO6 in pyroxenes probably depends on the relative availability (chemical potentials of A1 and Si) as well as temperature and pressure. The temperature of formation high as 650°C for the fassaite-plagioclase assemblage of calc-silicate vein is suggested.

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