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রাসায়নিক আবহবিকারের ফলে শিলার প্রধান খনিজ পরিবর্তিত হয়ে গৌণ খনিজে পরিণত হয়।
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রাসায়নিক আবহবিকারের ফলে শিলার প্রধান খনিজ পরিবর্তিত হয়ে গৌণ খনিজে পরিণত হয়।