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একাধিক খনিজ দ্বারা গঠিত শিলাখণ্ড উয়তার পরিবর্তনে। চূর্ণবিচূর্ণ হয়ে যে যান্ত্রিক আবহবিকার ঘটায় তাকে ক্ষুদ্রকণা বিশরণ বলে।
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একাধিক খনিজ দ্বারা গঠিত শিলাখণ্ড উয়তার পরিবর্তনে। চূর্ণবিচূর্ণ হয়ে যে যান্ত্রিক আবহবিকার ঘটায় তাকে ক্ষুদ্রকণা বিশরণ বলে।