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Sajan sarthak Best Answer
Here the temperature drops very rapidly but the process is like the solid which is formed is continuously being into the melt to form the new one that is Na rich. In layman language from 50 to 17 a great difference in Albite composition you think otherway An 50 to Albite 83 core is anothirte while rim is Albite and in high quantity so that solid which is formed is continuously taking part to form the rim so Equilibrium here the reaction is not seased.